Issue a build warning for debug builds

Author: Disasm

build.rs

@@ -0,0 +1,8 @@
+fn main() {
+    let profile = std::env::var("PROFILE").unwrap();
+    let target = std::env::var("TARGET").unwrap();
+
+    if profile == "debug" && !target.starts_with("x86_64") {
+        println!("cargo:warning=synopsys-usb-otg is being compiled in debug mode. This driver works reliably only in release mode!");
+    }
+}