Revert "winhttp: use win7 dll instead of win2ksp4, also add 64-bit support"
Revert "winhttp: use win7 dll instead of win2ksp4, also add 64-bit support"

This reverts commit 17dd1fb82953b40c8a5167d8a68249589c1acd34.

It breaks things, see https://github.com/Winetricks/winetricks/issues/831

Simply adding webio isn't enough, then it fails in a misisng ntdll function.
While we should prepare for when win2ksp4 isn't available, it currently is, so revert.

Winetricks/winetricks,Winetricks/winetricks