mesa: move ARB_viewport_array params to a GLES 3.1-accessible section
mesa: move ARB_viewport_array params to a GLES 3.1-accessible section

This is needed for GL_OES_viewport_array.

Signed-off-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>
Reviewed-by: Anuj Phogat <e2026475996c48f0b97fd37e84129b3912980428@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler