mesa: refactor: move multisample-related functions into new multisample.c file
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index a400550..f720298 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -105,6 +105,7 @@
 #include "lines.h"
 #include "macros.h"
 #include "matrix.h"
+#include "multisample.h"
 #include "pixel.h"
 #include "pixelstore.h"
 #include "points.h"