[Bug gcov-profile/82457] libgcov fork and exec hooks not always used

[miyuki at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82457

--- Comment #6 from Mikhail Maltsev <miyuki at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> Well fork and exec does not need to be the semantics of POSIX says it it. 
> So warning is not a good idea.

But don't libgcc wrappers already rely on those semantics?