This change let package maintainers use `tsl-robin-map_DIR` cmake parameter
with path set to cloned and built robin-map repo.

…talled (gnustep#275)

* Support building on msys/clang64
* Support libc++

* Implement PowerPC block trampoline

* Adjust pagesize on ppc64

* Skip UnexpectedException test for PowerPC

* Move PAGE_SIZE to asmconstants.h

* Use PAGE_SIZE and PAGE_SHIFT macros for PowerPC

* Add ppc64el and powerpc qemu-crossbuild targets

* Add NO_SAFE_CACHING definition and guards

* Do not export objc_method_cache_version on ppc32

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Co-authored-by: David Chisnall <davidchisnall@users.noreply.github.com>

We no longer need to manually set these suffixes/prefixes as CMake in MSYS2 now knows about Objective C.

See msys2/MINGW-packages#20028
See https://gitlab.kitware.com/cmake/cmake/-/merge_requests/9244
See msys2/MINGW-packages#20024 (comment)

The current implementation uses Vectored Exception Handlers. This implementation is too greedy, and invokes _objc_unexpected_exception for (certain) exceptions which would be handled by the application itself.

…loc_init

Fixes compiler errors on Windows