CrossOver 21.0.0 (#20)

* add version 21.0.0 (untested so far)

* fix SDL2 path for 21.0.0

* do not disable vulkan in 21.0.0

* disable kerberos as it leads to a build error

* Disable building DXVK in 20.x.x

Build failures seem to result from a too recent mingw-w64: version 9.x.x of mingw-w64 contains the DirectX code pieces from wine 6.0 which breaks the build of DXVK.

Unfortunately, there does not seem to exist a home-brew formula for mingw-w64 8.x.x. :-(

* add missing sincos() to msvcrt

see https://github.com/GabLeRoux/macos-crossover-cloud-build/pull/20#issuecomment-893488772

* remove '-fcommon' from CROSSFLAGS for 20.x.x and 21.x.x

see https://github.com/GabLeRoux/macos-crossover-cloud-build/pull/20#issuecomment-893488772



* remove version that we are pretty sure about to be not needed any more

* switch to manual run for now

* see if I can get this modularized (for now without the convoluted if-statements

* Cache and restore llvm/clang to avoid doing the same thing over and over again

* fix indentation

* build_monolithic.yml: Don't append @v1 to local actions

Locally hosted actions don't require a version

* replace deprecated hw.ncpu by hw.activecpu

* Squash CX21 & CX20 32on64 configure options

* squash 2x config steps

* consistency: uploading only makes sense if we created an archive

* Move something around test

* factor build step for llvm/clang into a separate action

* build llvm/clang in a separate job before building the different wine versions

* try to debug the unpacking failure

* fix tools download path

* oops - forgot to remove a local test

Co-authored-by: Gcenx <38226388+Gcenx@users.noreply.github.com>