When I initially ported things to meson some didn't correctly build in case
the install prefix wasn't the real prefix (/mingw64 vs C:/msys64/mingw64).
While this initially helped it turned out to be very stupid because I fixed
it by stripping the prefix of all install paths. This makes meson behave
differently compared to upstream.
Remove the patch and rebuild everything.
* upgrade some broken packages
* correct some broken urls/checksums
* use secure urls where possible
* update PKGBUILD templates
* remove line-ending whitespace
* minor typos/fixes
Remaining md5sums either didn't download or
didn't pass checksum tests.
