Very little optimization by using a simpler scope_guard when possible

The version with the vector, that can be disabled etc, is “very” slow, so we
use unique_ptr when we don’t need to disable it, and when it only contains
one function

louloulibs/utils/scopeguard.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <functional>
+#include <memory>
 #include <vector>
 
 /**
@@ -85,5 +86,11 @@ private:
 
 };
 
+template<typename F>
+auto make_scope_guard(F&& f)
+{
+  return std::unique_ptr<void, std::decay_t<F>>{(void*)1, std::forward<F>(f)};
+}
+
 }