glsl: validate arrays of arrays on empty type delclarations
glsl: validate arrays of arrays on empty type delclarations

Fixes:
dEQP-GLES31.functional.shaders.arrays_of_arrays.invalid.empty_declaration_without_var_name_fragment
dEQP-GLES31.functional.shaders.arrays_of_arrays.invalid.empty_declaration_without_var_name_vertex

Reviewed-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler