Update Harfbuzz to 7.1.0, support Draw API

.github/workflows/rust.yml

@@ -16,6 +16,8 @@ jobs:
 
  steps:
  - uses: actions/checkout@v2
+ with:
+ submodules: 'true'
  - name: Build
  run: cargo build --verbose --all-features
  - name: Run tests

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "harfbuzz"]
+ path = harfbuzz
+ url = https://github.com/harfbuzz/harfbuzz/

build.rs

@@ -21,12 +21,7 @@ fn main() {
  .flag("-std=c++11")
  .warnings(false)
  .include("harfbuzz/src")
- .files(
- std::fs::read_dir("harfbuzz/src")
- .expect("Could not find harfbuzz source files.")
- .map(|direntry| direntry.unwrap().path())
- .filter(|name| name.ends_with(".cc")),
- );
+ .file("harfbuzz/src/harfbuzz.cc");
 
  if !target.contains("windows") {
  cfg.define("HAVE_PTHREAD", "1");