[PATCH][buildrobot] libcpp/lex.c: Use enum properly

[Tom Tromey]

>>>>> "Andrew" == Andrew Pinski <pinskia@gmail.com> writes:

>> enum raw_str_phase phase = RAW_STR_PREFIX;

Andrew> This is a good work around but please add a comment of why this is
Andrew> needed (to work around a bug in XLC++).

I agree.
It's ok with this update.

thanks,
Tom