Attempt to fix makealias usage for build on Mac OS X.

Avoid using fcalias.h or fcaliastail.h on systems which don't support it.
Provided solution still generates these files, but does not use them.

src/fcint.h

@@ -48,7 +48,6 @@
 #include <fontconfig/fontconfig.h>
 #include <fontconfig/fcprivate.h>
 #include <fontconfig/fcfreetype.h>
-#include "fcalias.h"
 
 #ifndef FC_CONFIG_PATH
 #define FC_CONFIG_PATH "fonts.conf"
@@ -114,6 +113,8 @@
 /* slim_internal.h */
 #if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) && defined(__ELF__)
 #define FcPrivate		__attribute__((__visibility__("hidden")))
+#define HAVE_GNUC_ATTRIBUTE 1
+#include "fcalias.h"
 #elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
 #define FcPrivate		__hidden
 #else /* not gcc >= 3.3 and not Sun Studio >= 8 */

src/makealias

@@ -4,6 +4,7 @@ shift
 HEAD=fcalias.h
 TAIL=fcaliastail.h
 rm -f $HEAD $TAIL
+echo "#if HAVE_GNUC_ATTRIBUTE" >> $TAIL
 cat "$@" | grep '^Fc[^ ]* *(' | sed -e 's/ *(.*$//' |
 while read name; do
 	case $name in
@@ -22,3 +23,4 @@ while read name; do
 		;;
 	esac
 done
+echo "#endif" >> $TAIL