[Bug bootstrap/90808] gcc fails to build/bootstrap with XCode 10.2.1

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90808

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
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                 CC|                            |marxin at gcc dot gnu.org

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Apparently revision r272106:

ignore_scaling is not used ifndef IN_GCOV_TOOL, so needs the magic incantation.