Use cargo as a build system instead of makefiles

build.rs

@@ -0,0 +1,8 @@
+fn main() {
+    // https://doc.rust-lang.org/cargo/reference/build-scripts.html
+    // cargo-equivalent to running rustc -L./raylib/ -lraylib test.rs -o bin/test
+    // to link against the libraylib.a static library
+    println!("cargo:rustc-link-search=./raylib");
+    println!("cargo:rustc-link-lib=static=raylib");
+}
+