Remove unused libc_musl_for_sysroot am: 66e93bab07

Original change: https://android-review.googlesource.com/c/platform/external/musl/+/2075645

Change-Id: Icd51f17882d571f424d751adffc609e5fb0355f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>