mesa: Replace MESA_VERSION with PACKAGE_VERSION.

One fewer place to have to update.

Reviewed-by: Eric Anholt <eric@anholt.net>
diff --git a/src/mesa/drivers/x11/fakeglx.c b/src/mesa/drivers/x11/fakeglx.c
index 2208d5e..1909b08 100644
--- a/src/mesa/drivers/x11/fakeglx.c
+++ b/src/mesa/drivers/x11/fakeglx.c
@@ -63,7 +63,7 @@
 #define SERVER_MINOR_VERSION 4
 
 /* This is appended onto the glXGetClient/ServerString version strings. */
-#define MESA_GLX_VERSION "Mesa " MESA_VERSION_STRING
+#define MESA_GLX_VERSION "Mesa " PACKAGE_VERSION
 
 /* Who implemented this GLX? */
 #define VENDOR "Brian Paul"