i965: unify the code to enable of ARB_gpu_shader_fp64 and ARB_vertex_attrib_64bit for HSW+
i965: unify the code to enable of ARB_gpu_shader_fp64 and ARB_vertex_attrib_64bit for HSW+

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>

Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler