(svn r7796) -Fix (r7759): cygwin does not need to rewrite the paths for strgen.

-Fix (r7759): supply the correct flags to cygwin to make it compile.

Note: cygwin itself is 'broken'. Known issues with cygwin are:
 - bash does not work when including files that have dos line ending (\r\n).
   This causes the strange errors in config.lib. The solution is running:
     dos2unix config.lib
 - the windows-native svn does not work (though it previously did). The
   solution for this is to install the cygwin svn.
 - libfreetype2's freetype-config --cflags does not have ft2build.h in the
   path include search path. The workaround for this is to copy 
   /usr/include/ft2build.h to /usr/include/freetype2/. Also linking does 
   not work for static builds as freetype-config does not support that.
   You have to add the '--disable-static' flag when running './configure'.
 - libpng12 does not work with static building either. You have to add
   the '--disable-static' flag when running './configure' too.

config.lib

@@ -933,7 +933,7 @@ make_cflags_and_ldflags() {
 		CFLAGS="$CFLAGS -mwin32"
 		LDFLAGS="$LDFLAGS -mwin32"
 	fi
-	if [ "$os" = "MINGW" ]
+	if [ "$os" = "MINGW" ] || [ "$os" = "CYGWIN" ]
 	then
 		CFLAGS="$CFLAGS -mno-cygwin"
 		LDFLAGS="$LDFLAGS -mno-cygwin"
@@ -951,7 +951,7 @@ make_cflags_and_ldflags() {
 		LIBS="$LIBS -lrt"
 	fi
 
-	if [ "$os" != "MINGW" ]
+	if [ "$os" != "CYGWIN" ] && [ "$os" != "MINGW" ]
 	then
 		LIBS="$LIBS -lc"
 	fi

src/strgen/strgen.c

@@ -1271,7 +1271,7 @@ static inline char *mkpath(char *buf, size_t buflen, const char *path, const cha
 	return buf;
 }
 
-#if defined(__MINGW32__) || defined(__CYGWIN__)
+#if defined(__MINGW32__)
 /**
  * On MingW, it is common that both / as \ are accepted in the
  * params. To go with those flow, we rewrite all incoming /