[Bug target/68774] gcc should allow disabling markup in Xcode 7 assembler messages

[mrs at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68774

--- Comment #1 from mrs at gcc dot gnu.org <mrs at gcc dot gnu.org> ---
I glanced around and didn't find how to turn it off.  First step, ask around
and find the option to turn it off.  From there, we can pass it when the gcc
option to not color is given.