fix build on windows

[mattn]

No description provided.

[codecov-io]

Codecov Report

Merging #1912 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1912      +/-   ##
==========================================
- Coverage   75.09%   75.08%   -0.01%     
==========================================
  Files          76       76              
  Lines      125288   125327      +39     
==========================================
+ Hits        94082    94105      +23     
- Misses      31206    31222      +16

Impacted Files	Coverage Δ
src/if_xcmdsrv.c	83.33% <0%> (-2.04%)	⬇️
src/version.c	79.29% <0%> (-1.02%)	⬇️
src/os_unix.c	56.98% <0%> (-0.15%)	⬇️
src/gui_gtk_x11.c	47.5% <0%> (-0.11%)	⬇️
src/window.c	81.32% <0%> (-0.1%)	⬇️
src/channel.c	83.55% <0%> (-0.1%)	⬇️
src/term.c	52.93% <0%> (-0.06%)	⬇️
src/gui.c	45.53% <0%> (-0.06%)	⬇️
src/message.c	68.35% <0%> (+0.05%)	⬆️
src/undo.c	81.64% <0%> (+0.06%)	⬆️
... and 2 more

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[mattn]

DO NOT CLOSE THIS.

Windows build still broken. Missing semi-colon in previous line.