Remove #ifdef WINPROC_OVERRIDE code sections

These sections are from the zilmar Glide64 implementation (unused) and cause
build errors when accidently activated.
Remove #ifdef OLD_API code section

These sections are from the zilmar Glide64 implementation (unused) and cause
build errors when accidently activated.
Merge pull request #10 from fayvel/obsolete_windows

Remove obsolete #ifdef code sections