[Ohrrpgce] SVN: teeemcee/9148 Make gfx_directx use 0/-1 for the bools in WindowState rather than 0/1

[subversion at HamsterRepublic.com]

teeemcee
2017-08-12 05:52:57 -0700 (Sat, 12 Aug 2017)
118
Make gfx_directx use 0/-1 for the bools in WindowState rather than 0/1

As far as I'm aware, this doesn't fix any bug.
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U   wip/gfx.h
U   wip/gfx_directx/gfx_directx.cpp