update harfbuzz to 10.1.0

libs/harfbuzz/test/fuzzing/README.md

@@ -0,0 +1,17 @@
+To build the fuzzers with libFuzzer to perform actual fuzzing, build with:
+
+```shell
+CXX=clang++ CXXFLAGS="-fsanitize=address,fuzzer-no-link" meson fuzzbuild --default-library=static -Dfuzzer_ldflags="-fsanitize=address,fuzzer"
+
+ninja -Cfuzzbuild
+```
+
+Then, run the fuzzer like this:
+
+fuzzbuild/test/fuzzing/hb-{shape,draw,subset,set}-fuzzer [-max_len=2048] [CORPUS_DIR]
+
+Where max_len specifies the maximal length of font files to handle.
+The smaller the faster.
+
+For more details consult the following locations:
+  - http://llvm.org/docs/LibFuzzer.html