Merge pull request #13851 from lovesegfault/http-binary-cache-store-once

refactor(libstore/http-binary-cache-store): pragma once

Author: xokdvium

src/libstore/include/nix/store/http-binary-cache-store.hh

@@ -1,3 +1,6 @@
+#pragma once
+///@file
+
 #include "nix/util/url.hh"
 #include "nix/store/binary-cache-store.hh"