Don't use thread_local on mingw or OpenBSD builds #5541
Merged
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MingW has broken support for thread_local, so force disabling it. See:
https://sourceforge.net/p/mingw-w64/bugs/445/
https://sourceforge.net/p/mingw-w64/bugs/527/
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80816
Also OpenBSD has no thread_local support, see https://issues.qgis.org/issues/17351
So on these platforms we fall back to using QThreadStorage.
Fixes #17351
Supersedes #5504