glsl: add missing blend_support qualifier in validate_flags()
glsl: add missing blend_support qualifier in validate_flags()

Signed-off-by: Samuel Pitoiset <506e97eed81d9e59d22f4c73fb51123bb62b4a30@gmail.com>
Reviewed-by: Andres Gomez <1948e91ee7852f22bc880d172a32ffca98fb60fa@igalia.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler