Add config.toml to hyperlight_guest_bin so it builds standalone on windows

Signed-off-by: Simon Davies <[email protected]>

Author: simongdavies

src/hyperlight_guest_bin/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "x86_64-unknown-none"

src/hyperlight_guest_bin/build.rs

@@ -95,7 +95,9 @@ fn cargo_main() {
         cfg.flag("-mstack-probe-size=4096");
         cfg.compiler("clang");
 
-        unsafe { env::set_var("AR_x86_64_unknown_none", "llvm-ar") };
+        if cfg!(windows) {
+            unsafe { env::set_var("AR_x86_64_unknown_none", "llvm-ar") };
+        }
         cfg.compile("hyperlight_guest_bin");
     }