mesa: Remove old validate_io function
mesa: Remove old validate_io function

The new validate_io catches all of the cases (and many more) that the
old function caught.

Signed-off-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Timothy Arceri <5dd83789ef3714029244367ba1ca09f1d7627408@collabora.com>
Reviewed-by: Alejandro Piñeiro <5dfedca1889afcca58e9b95acd46f78f54f166ed@igalia.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler