Fix non-autotools builds: Always define the LIBSSH2_OPENSSL CPP macro

Commit d512b25f69a1b6778881f6b4b5ff9cfc6023be42 introduced a crypto
library abstraction in the autotools build system, to allow us to more
easily support new crypto libraries. In that process it was found that
all other build system which we support are hard-coded to build with
OpenSSL. Commit f5c1a0d98bd51aeb24aca3d49c7c81dcf8bd858d fixes automake
introduced into non-autotools build systems but still overlooked the
CPP macro saying that we are using OpenSSL.

Thanks to Marc Hörsken for identifying this issue and proposing a fix
for win32/{GNUmakefile,config.mk}. This commit uses a slightly different
approach but the end result is the same.

nw/GNUmakefile

@@ -214,6 +214,7 @@ endif
 vpath %.c . ../src
 
 # only OpenSSL is supported with this build system
+CFLAGS += -DLIBSSH2_OPENSSL
 include ../Makefile.OpenSSL.inc
 
 # include Makefile.inc to get CSOURCES define

win32/GNUmakefile

@@ -180,6 +180,7 @@ CFLAGS	+= $(INCLUDES)
 vpath %.c . ../src
 
 # only OpenSSL is supported with this build system
+CFLAGS += -DLIBSSH2_OPENSSL
 include ../Makefile.OpenSSL.inc
 
 # include Makefile.inc to get CSOURCES define

win32/Makefile.Watcom

@@ -94,6 +94,7 @@ LIB_ARG  = $(OBJ_BASE)\stat\wlib.arg
 !error You MUST call wmake with the -u switch!
 !else
 # only OpenSSL is supported with this build system
+CFLAGS += -dLIBSSH2_OPENSSL
 !include ..\Makefile.OpenSSL.inc
 !include ..\Makefile.inc
 !endif

win32/config.mk

@@ -29,7 +29,7 @@ CPPFLAGS=/Oi /O2 /Oy /GF /Y- /MD /DNDEBUG
 DLLFLAGS=/DEBUG /LD
 !endif
 
-CPPFLAGS=/nologo /GL /Zi /EHsc $(CPPFLAGS) /Iwin32 /Iinclude /I$(OPENSSLINC) $(ZLIBINC)
+CPPFLAGS=/nologo /GL /Zi /EHsc $(CPPFLAGS) /Iwin32 /Iinclude /DLIBSSH2_OPENSSL /I$(OPENSSLINC) $(ZLIBINC)
 CFLAGS=$(CPPFLAGS)
 RCFLAGS=/Iinclude
 DLLFLAGS=$(CFLAGS) $(DLLFLAGS)

win32/msvcproj.head

@@ -1,6 +1,7 @@
 # Microsoft Developer Studio Project File - Name="libssh2" - Package Owner=<4>
 # Microsoft Developer Studio Generated Build File, Format Version 6.00
 # ** DO NOT EDIT **
+# only OpenSSL is supported with this build system
 
 # TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
 # TARGTYPE "Win32 (x86) Static Library" 0x0104
@@ -45,8 +46,8 @@ RSC=rc.exe
 # PROP Intermediate_Dir "Release_dll"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /YX /FD /c
+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /YX /FD /c
-# ADD CPP /nologo /MD /W3 /GX /O2 /I "..\win32" /I "..\include" /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /YX /FD /c
+# ADD CPP /nologo /MD /W3 /GX /O2 /I "..\win32" /I "..\include" /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /YX /FD /c
 # SUBTRACT CPP /YX
 # ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
@@ -72,8 +73,8 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Debug_dll"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c
-# ADD CPP /nologo /MD /W3 /Gm /GX /ZI /Od /I "..\win32" /I "..\include" /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /D "LIBSSH2DEBUG" /YX /FD /GZ /c
+# ADD CPP /nologo /MD /W3 /Gm /GX /ZI /Od /I "..\win32" /I "..\include" /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /D "LIBSSH2DEBUG" /YX /FD /GZ /c
 # SUBTRACT CPP /WX /YX
 # ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
 # ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
@@ -99,8 +100,8 @@ LINK32=link.exe
 # PROP Output_Dir "Release_lib"
 # PROP Intermediate_Dir "Release_lib"
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /YX /FD /c
+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /YX /FD /c
-# ADD CPP /nologo /MD /W3 /GX /O2 /I "..\win32" /I "..\include" /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /YX /FD /c
+# ADD CPP /nologo /MD /W3 /GX /O2 /I "..\win32" /I "..\include" /D "WIN32" /D "NDEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /YX /FD /c
 # ADD BASE RSC /l 0x409 /d "NDEBUG"
 # ADD RSC /l 0x409 /d "NDEBUG"
 BSC32=bscmake.exe
@@ -123,8 +124,8 @@ LIB32=link.exe -lib
 # PROP Output_Dir "Debug_lib"
 # PROP Intermediate_Dir "Debug_lib"
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c
-# ADD CPP /nologo /MD /W3 /Gm /GX /ZI /Od /I "..\win32" /I "..\include" /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "_MBCS" /D "_LIB" /D "LIBSSH2DEBUG" /YX /FD /GZ /c
+# ADD CPP /nologo /MD /W3 /Gm /GX /ZI /Od /I "..\win32" /I "..\include" /D "WIN32" /D "_DEBUG" /D "LIBSSH2_WIN32" /D "LIBSSH2_OPENSSL" /D "_MBCS" /D "_LIB" /D "LIBSSH2DEBUG" /YX /FD /GZ /c
 # ADD BASE RSC /l 0x409 /d "_DEBUG"
 # ADD RSC /l 0x409 /d "_DEBUG"
 BSC32=bscmake.exe