aubinator: Fix compiler warning
aubinator: Fix compiler warning

Add 'const' qualifier to gen_field_iterator::p pointer (Ken)

Signed-off-by: Sirisha Gandikota <7ec99f51d7999bb48dd8d8e6e62142761b51dec5@intel.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler