drirc: add a workaround for blackness in Warsow
drirc: add a workaround for blackness in Warsow

Cc: 11.1 11.2 <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler