glapi: Include headers with directory prefixes.

This allows different sets of generated sources and headers to be used.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
diff --git a/src/mesa/glapi/gl_enums.py b/src/mesa/glapi/gl_enums.py
index 27ab119..acaa06a 100644
--- a/src/mesa/glapi/gl_enums.py
+++ b/src/mesa/glapi/gl_enums.py
@@ -42,10 +42,10 @@
 
 
 	def printRealHeader(self):
-		print '#include "glheader.h"'
-		print '#include "mfeatures.h"'
-		print '#include "enums.h"'
-		print '#include "imports.h"'
+		print '#include "main/glheader.h"'
+		print '#include "main/mfeatures.h"'
+		print '#include "main/enums.h"'
+		print '#include "main/imports.h"'
 		print ''
 		print 'typedef struct {'
 		print '   size_t offset;'