Remove unused min/max definitions. BUG=17878699 Change-Id: If48ef9b43e140e9f43687edf55928d932247d513 Reviewed-on: https://swiftshader-review.googlesource.com/1201 Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Nicolas Capens <nicolascapens@google.com>