build/sources.mak: Add src/glsl/glcpp to INCLUDE_DIRS
authorMatt Turner <mattst88@gmail.com>
Wed, 1 Aug 2012 21:02:23 +0000 (14:02 -0700)
committerMatt Turner <mattst88@gmail.com>
Tue, 14 Aug 2012 17:54:38 +0000 (10:54 -0700)
Fixes problem where libdricore's of-out-tree build couldn't find
glcpp.h.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

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