glsl/glcpp/tests: reinstate srcdir/abs_builddir blurb
Bring back the "detection" of the said variables, to allow standalone execution. Fixes: db8cd8e3 ("glcpp/tests: Convert shell scripts to a python script") Cc: Dylan Baker <dylan@pnwbakers.com> Signed-off-by:Emil Velikov <emil.velikov@collabora.com> Reviewed-by:
Dylan Baker <dylan@pnwbakers.com>
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