Remove unused libc_musl_for_sysroot

The sysroot is now using the same libc_musl.so, with a linker script
to rewrite references from libc.so to libc_musl.so.

Bug: 216192129
Test: builds
Change-Id: I21a874edeef158585873c3193d7d88a203c76f2a
1 file changed