anv/device: Properly handle apiVersion == 0
anv/device: Properly handle apiVersion == 0

From the Vulkan 1.0 spec section 3.2:

"If apiVersion is 0 the implementation must ignore it"

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler