mesa: Ignore glPointSize when GL_POINT_SIZE_ARRAY_OES is enabled
mesa: Ignore glPointSize when GL_POINT_SIZE_ARRAY_OES is enabled

When a user defines a point size array and enables it, the point
size value set via glPointSize should be ignored. To achieve this,
we can simply toggle ctx->VertexProgram.PointSizeEnabled.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=42187
Signed-off-by: Plamena Manolova <6e3d0a3190b3ecb5aa3b51200dd755290989ee5d@intel.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler