mesa: Walk the VAO in _mesa_print_arrays.
mesa: Walk the VAO in _mesa_print_arrays.

Only a debugging function, but move away from
gl_client_array and use the first order information
from the VAO. Also make use of gl_vert_attrib_name.

Signed-off-by: Mathias Fröhlich <f51464c0d83b5283880370f10770eaa83440cc6a@web.de>
Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler