vendor raymenu dependencies

raymenu/vendor/github.com/ebitengine/purego/go_runtime.go

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux || netbsd || windows
+
+package purego
+
+import (
+	"unsafe"
+)
+
+//go:linkname runtime_cgocall runtime.cgocall
+func runtime_cgocall(fn uintptr, arg unsafe.Pointer) int32 // from runtime/sys_libc.go