Clang-cl couldn't find the header given to it by -FI when it isn't in
any of the included directories.
Additionally clang-cl 8 has a bug with exported templated classes with
inline methods that causes it to have missing symbols at link time. We
work around this.
Fixes: QTBUG-74563
Change-Id: I7becf05fa8edb07bd4cefe12bee3737e5e1dfa14
Reviewed-by: Yuhang Zhao <2546789017@qq.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
eaf20420f8