gallium/tests: remove unneeded include paths
gallium/tests: remove unneeded include paths

The tests don't (and shouldn't) need to have anything driver and/or
winsys specific.

Signed-off-by: Emil Velikov <4c996f2f093ddd0585a556460b4cc3ba555546ef@gmail.com>
Acked-by: Rob Clark <6f78cdb10adbe0a7fbbf4098125a51f401c77a5f@freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler