r600: Include missing header in evergreen_render.c.

Fixes the following GCC warning.
evergreen_render.c: In function 'evergreenTryDrawPrims':
evergreen_render.c:836: error: implicit declaration of function 'evergreenSetupFragmentProgram'

src/mesa/drivers/dri/r600/evergreen_render.c

@@ -46,6 +46,7 @@
 #include "r600_context.h"
 #include "r600_cmdbuf.h"
 
+#include "evergreen_fragprog.h"
 #include "evergreen_vertprog.h"
 
 #include "evergreen_state.h"