[build] fix for make multi

Fix "make multi" by MR !223

* include/freetype/internal/services/svmm.h: include ftmm.h to define FT_Get_MM_Func.
* src/truetype/ttgxvar.h: include ftmmtypes.h to use GX_AVarTable properly.
* src/base/ftmac.c: include ftdebug.h to use FT_THROW() properly.

include/freetype/internal/services/svmm.h

@@ -19,6 +19,7 @@
 #ifndef SVMM_H_
 #define SVMM_H_
 
+#include <freetype/ftmm.h>
 #include <freetype/internal/ftserv.h>
 #include <freetype/internal/ftmmtypes.h>
 

src/base/ftmac.c

@@ -67,6 +67,7 @@
 
 #include <freetype/freetype.h>
 #include <freetype/tttags.h>
+#include <freetype/internal/ftdebug.h>
 #include <freetype/internal/ftstream.h>
 #include "ftbase.h"
 

src/truetype/ttgxvar.h

@@ -20,6 +20,7 @@
 #define TTGXVAR_H_
 
 
+#include <freetype/internal/ftmmtypes.h>
 #include "ttobjs.h"