Ticket #413 (Make dist do not include mc.charset)

Description:
If before
  make dist*
  ./configure

was invoked without parameters next build from resulted tarball with
  ./configure --enable-charset
stop on error "mc.charset not found".
"./configure --enable-charset" hack before make dist* resolve this trouble.

Fix issue: In contrib/Makefile.am EXTRA_DIST variable was contain filenames relative to --enable-charset option.
Now mc.charsets file alvays present in EXTRA_DIST variable.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

contrib/Makefile.am

@@ -26,7 +26,7 @@ CLEANFILES = $(SCRIPTS_OUT)
 EXTRA_DIST = \
 	$(SCRIPTS_IN) \
 	$(noinst_DATA) \
-	$(cfg_DATA)
+	mc.charsets
 
 mc.csh: $(srcdir)/mc.csh.in
 	sed "s%@""pkglibexecdir@%$(pkglibexecdir)%" $(srcdir)/mc.csh.in > mc.csh