dri/common: fix gbm-symbols-check regression
dri/common: fix gbm-symbols-check regression

Broken by commit c228514c72cb2fd5fb9e510808e29204fc9e7ae1
"dri/common: use sysconfdir when looking for drirc".

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92054
Signed-off-by: Marcin Ślusarz <bc4bbf83189bf2aa3b4ae434673d425054bbfadd@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler