The initial version of patches resulted in a test failure in inetmib1 tests. While I could not reproduce the failure itself locally I think I figured what's going on. While no test failures the test (with some extra output) wasn't showing much of actual data from ip forward table (while that works on Windows with Wine's inetmib1.dll). inetmib1 depends on the sort in GetIpForwardTable() (so that the result is sorted by dest address as primary key). That sort got broken a while ago with commit 3aa18cc5d01028bda126624ba5f5bfb11ebc4f77 . Adding loopback entries to the forward table accidentally revealed the breakage by failing test on one machine.
"iphlpapi: Fix ipforward_row_cmp()." fixes test failure on Testbot and the actual output of the forward table query in inetmib1. "iphlpapi: Fix udp_row_cmp().". is unrelated but I added it while I am there since there is the same issue.