mesa: Directly include mfeatures.h in files that perform feature tests.
diff --git a/src/mesa/main/ffvertex_prog.c b/src/mesa/main/ffvertex_prog.c
index 0f2c313..b8e49a3 100644
--- a/src/mesa/main/ffvertex_prog.c
+++ b/src/mesa/main/ffvertex_prog.c
@@ -36,6 +36,7 @@
 #include "main/glheader.h"
 #include "main/mtypes.h"
 #include "main/macros.h"
+#include "main/mfeatures.h"
 #include "main/enums.h"
 #include "main/ffvertex_prog.h"
 #include "program/program.h"