scons/glsl: add top-level 'include' dir to CPPPATH

To avoid using the /usr/include/GL/gl.h file which may be lacking
some special #defines.

diff --git a/src/glsl/SConscript b/src/glsl/SConscript
index 6a23476..2cc7b0e 100644 (file)
--- a/src/glsl/SConscript
+++ b/src/glsl/SConscript
@@ -7,6 +7,7 @@ from sys import executable as python_cmd
 env = env.Clone()
 
 env.Prepend(CPPPATH = [
+    '#include',
     '#src/mapi',
     '#src/mesa',
     '#src/glsl',