harfbuzz recipe build fail

[RobertFlatt]

Logs

make[4]: Entering directory '/home/bobf/ex/regression/.buildozer/android/platform/build-arm64-v8a/build/other_builds/harfbuzz/arm64-v8a__ndk_target_21/harfbuzz/src'
make[4]: warning: -j12 forced in submake: resetting jobserver mode.
  GEN      libharfbuzz.la
  GEN      harfbuzz.pc
  GEN      harfbuzz-subset.pc
  CXX      libharfbuzz_subset_la-hb-subset-cff1.lo
  CXXLD    main
  CXXLD    test
  CXXLD    test-buffer-serialize
  CXXLD    test-ot-meta
  CXXLD    test-ot-name
  CXXLD    test-gpos-size-params
  CXXLD    test-gsub-would-substitute
hb-subset-cff1.cc:472:33: error: variable 'supp_size' set but not used [-Werror,-Wunused-but-set-variable]
    unsigned int  size0, size1, supp_size;
                                ^
1 error generated.