examples: fix forktty() warning on OSX

ConfigureChecks.cmake

@@ -50,6 +50,7 @@ check_include_file(argp.h HAVE_ARGP_H)
 check_include_file(pty.h HAVE_PTY_H)
 check_include_file(termios.h HAVE_TERMIOS_H)
 check_include_file(unistd.h HAVE_UNISTD_H)
+check_include_file(util.h HAVE_UTIL_H)
 
 if (WIN32)
   check_include_files("winsock2.h;ws2tcpip.h;wspiapi.h" HAVE_WSPIAPI_H)

config.h.cmake

@@ -20,6 +20,9 @@
 /* Define to 1 if you have the <pty.h> header file. */
 #cmakedefine HAVE_PTY_H 1
 
+/* Define to 1 if you have the <util.h> header file. */
+#cmakedefine HAVE_UTIL_H 1
+
 /* Define to 1 if you have the <termios.h> header file. */
 #cmakedefine HAVE_TERMIOS_H 1
 

examples/samplesshd-tty.c

@@ -28,7 +28,9 @@ clients must be made or how a client should react.
 #ifdef HAVE_PTY_H
 #include <pty.h>
 #endif
-
+#ifdef HAVE_UTIL_H
+#include <util.h>
+#endif
 #define SSHD_USER "libssh"
 #define SSHD_PASSWORD "libssh"