Add basic musl support to make

There are still devices that set BUILD_BROKEN_USES_BUILD_HOST_* and
build host modules in Make.  Add basic support for building against
libc_musl in Make when USE_HOST_MUSL is set.

Bug: 258535366
Test: build a host tool defined in Android.mk file in internal branch
Change-Id: I9150be749bbeaac2ac5a33b2cf915004aa3033df