[llvm] [llvm][HTTP] Apply WinHTTP timeout setting after WinHttpOpen (PR #188969)

[via llvm-commits]

Nerixyz wrote:

>From my side, this looks good now. In https://github.com/llvm/llvm-project/pull/192061#issuecomment-4926882131 I noticed that the timeout we can specify isn't that precise, but that seems to be a quirk of WinHTTP. For our use-cases, it should be fine if the actual timeout is slightly off (+ about 2s)

https://github.com/llvm/llvm-project/pull/188969