configure.ac: check require_basic_egl only if egl enabled

Fixes: 1ac40173c2a ("configure.ac: simplify EGL requirements for drivers dependent on EGL")
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
1 file changed