convert 32-bit PowerPC GNU/Linux to TARGET_OS_CPP_BUILTINS

[Neil Booth]

Hi Matt,

Sorry I can't reply to your e-mail normally, but my internet
connection is up the shoot and I'm not getting email (or
anything).

Your patch's use of builtin_define_std is incorrect; please
read the docs in tm.texi or the comments in c-common.c.

Also, please avoid doing a #undef on TARGET_OS_CPP_BUILTINS.
No port has needed it so far; I don't see why any port should
need it.  You might need to rearrange config.gcc a bit, or
use a nested submacro that is overridden and #undef-ed.

Neil.