Revision 243196 breaks bootstrap on x86_64-w64-mingw32 using --with-sysroot

[Rainer Emrich]

Revision 243196 breaks native bootstrap on x86_64-w64-mingw32 using
--with-sysroot to point gcc to the mingw-w64 runtime. This used to work
since years until then.

The bootstrap fails in stage 1 building libgcc due to not finding the
runtime libraries.

I opened PR 78880.

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