Nested functions are supported as an extension in GNU C, but Clang don't support them. This fixes compilation errors when (manually) building compute.c, or by setting --enable-gallium-tests to the configure script. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75165 Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>