shiny/driver/windriver: fix build on windows
shiny/driver/windriver: fix build on windows

Change-Id: I6aa0c2333f0b5a459fe087f5bca24be290663236
Reviewed-on: https://go-review.googlesource.com/13782
Reviewed-by: Nigel Tao <58ae08b3356928ff9c67562b4719487d54fe8348@golang.org>

AkihiroSuda/golang-exp-aspectgo,golang/exp,JamesDunne/exp,golang/exp,AkihiroSuda/golang-exp-aspectgo,AkihiroSuda/golang-exp-aspectgo,golang/exp,JamesDunne/exp