Hi,

attached is a v2 of the musl-cross-make clang build patch.

Changes from v1:

* Install clang-resource-headers (fixes missing stdatomic.h, etc.)
* Fix installed symlinks (fixes missing cc, c++, cpp)
* Statically link libunwind and libc++abi into libc++.a and libc++.so
* Updated patch for armv7m clang VFP asm crash
* Support setting COMPILER from config.mak
* Support target specific musl config by setting MUSL_CONFIG_<target> variable

Patrick