The regular zstd package has switched so the static-compat needs to switch
as well as otherwise the CMake find module from the regular package is
picked up (e.g. by Qt 6).
* Use an older glibc so resulting binaries can run
on older systems (without having to link statically
against glibc)
* Call packages static-compat-* to make it clear that
these packages are intended for compatibility with
older distributions
* Add further libraries to get static-compat-qt6-base
and some other static-compat-qt6-* packages building
Martchus