Add libqoi helper crate that wraps qoi.h

libqoi/build.rs

@@ -0,0 +1,18 @@
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+fn main() {
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    let out_src = out_dir.join("qoi.c");
+    fs::write(&out_src, "#include \"qoi.h\"\n").unwrap();
+
+    cc::Build::new()
+        .file(&out_src)
+        .include("../ext/qoi")
+        .define("QOI_NO_STDIO", None)
+        .define("QOI_IMPLEMENTATION", None)
+        .flag("-Wno-unsequenced")
+        .opt_level(3)
+        .compile("qoi");
+}