mesa/st: add support for NIR as possible driver IR

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Acked-by: Eric Anholt <eric@anholt.net>
diff --git a/src/mesa/SConscript b/src/mesa/SConscript
index 7174101..434800e 100644
--- a/src/mesa/SConscript
+++ b/src/mesa/SConscript
@@ -13,6 +13,7 @@
 env.MSVC2013Compat()
 
 env.Append(CPPPATH = [
+    '../compiler/nir',  # for generated nir_opcodes.h, etc
     '#/src',
     '#/src/mapi',
     '#/src/glsl',