libretro: Re-enable hw context switch, add auto option

src/common/make_array.h

@@ -0,0 +1,12 @@
+#pragma once
+#include <array>
+#include <type_traits>
+
+// Source: https://gist.github.com/klmr/2775736#file-make_array-hpp
+
+template<typename... T>
+constexpr auto make_array(T&&... values)
+  -> std::array<typename std::decay<typename std::common_type<T...>::type>::type, sizeof...(T)>
+{
+  return {std::forward<T>(values)...};
+}