[Ohrrpgce] SVN: teeemcee/12262 Cleanup DrMingw code in os_windows.bas slightly; add missing win32/exchn

[subversion at HamsterRepublic.com]

teeemcee
2021-04-15 21:55:28 -0700 (Thu, 15 Apr 2021)
204
Cleanup DrMingw code in os_windows.bas slightly; add missing win32/exchndl.bi

However I'm not putting the DrMingw dlls in the repo. I'm tempted to delete
DrMingw support instead, it's not currently used.
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U   wip/os_windows.bas
A   wip/win32/exchndl.bi