Fix system/libfmq compiling against musl am: 02ec6a2f43 am: 340b3045a6

Original change: https://android-review.googlesource.com/c/platform/system/libfmq/+/1826813

Change-Id: Iecc527c657916e7f1a08072eb1fe66392a644786
tree: b881890651c645b5ef3fde32a1ff9eb83684a7fe
  1. base/
  2. benchmarks/
  3. fuzzer/
  4. include/
  5. tests/
  6. Android.bp
  7. EventFlag.cpp
  8. FmqInternal.cpp
  9. OWNERS
  10. PREUPLOAD.cfg
  11. TEST_MAPPING