include windows.h only on windows

4 jobs for isuruf-master-patch-51992 in 15 minutes and 35 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #55812
docker linux64
linux64_ci

00:06:55

passed #55813
docker linux64
linux64_compatibility_ci

00:08:37

passed #55814
shared windows64
windows64_ci

00:11:44

passed #55815
shared windows64
windows64_msvc_ci

00:03:23