[Bug bootstrap/117893] [15 regression] space before -O0 in CFLAGS incorrectly removed

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117893

--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
Was wondering how I hadn't noticed this but it's because we just patch out the
sed entirely because it's troublesome.