[truetype] Fix `make multi'. * src/truetype/ttgxvar.c: Include freetype/internal/services/svmetric.h for the FT_Service_MetricsVariations type definition.
diff --git a/src/truetype/ttgxvar.c b/src/truetype/ttgxvar.c
index 3af028a..80553c9 100644
--- a/src/truetype/ttgxvar.c
+++ b/src/truetype/ttgxvar.c
@@ -45,6 +45,7 @@
#include <freetype/internal/ftcalc.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/sfnt.h>
+#include <freetype/internal/services/svmetric.h>
#include <freetype/tttags.h>
#include <freetype/ttnameid.h>
#include <freetype/ftmm.h>