High CPU usage in main menu

[fergushev]

The current sleep fix for D2Win (https://github.com/bayaraa/d2gl/blob/master/d2gl/src/d2/common.cpp#L175) doesn't appear to work as expected. CPU usage is high both with and without that patch and it looks something like this:

(This is "% Processor Time" in Perfmon)

If you change it to NOP 6 bytes (TEST, JZ, XOR) starting at offset D2WIN+0x18A5D (1.13c) then you keep the Sleep(20) call and CPU usage looks like this: