[patch] ignore lto-wrapper warnings for lto builds

[Matthias Klose]

I see these warnings from time to time, when configuring a build with 
--enable-pgo-build=lto, I haven't yet found out why I see these sometime, and 
why not. E.g. https://gcc.gnu.org/PR109241. Just ignore these when they appear 
in test cases.

lto-wrapper: warning: using serial compilation of N LTRANS jobs

Ok for the trunk?

Matthias
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