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.
Version 2.6 and 3.0 can be installed in parallel
for smoother transition.
This commit just reverts the old PKGBUILD into a separate directory.
The availability of the 2.6 version should close issue #1343.
