Backport several required MSYS2 fixes into 1.22
Backport several commits from !1216 (merged) and older MRs that are needed to build 1.22 binaries on Windows with MSYS2.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Backport several commits from !1216 (merged) and older MRs that are needed to build 1.22 binaries on Windows with MSYS2.