Pull in libintl.h (indirectly) before using anything from it. Fixes
/usr/local/include/libintl.h:1019:17: error: cannot apply asm label to function after its first use

Index: fontforge/splinefont.h
--- fontforge/splinefont.h.orig
+++ fontforge/splinefont.h
@@ -31,6 +31,7 @@
 #include "basics.h"
 #include "dlist.h"
 #include "gwwiconv.h"
+#include "intl.h"
 #include "ustring.h"
 #include "splinechar.h"
 #include "splinefont_enums.h"
