Use protoc-mingw on Windows.
Use protoc-mingw on Windows.

Native protoc-windows.exe fails to support paths longer that 1024
characters.

Needed for #276.

--
MOS_MIGRATED_REVID=113834005

werkt/bazel,LuminateWireless/bazel,variac/bazel,hermione521/bazel,perezd/bazel,safarmer/bazel,mikelalcon/bazel,whuwxl/bazel,variac/bazel,Asana/bazel,whuwxl/bazel,cushon/bazel,aehlig/bazel,mikelikespie/bazel,bazelbuild/bazel,akira-baruah/bazel,Asana/bazel,damienmg/bazel,aehlig/bazel,ulfjack/bazel,twitter-forks/bazel,meteorcloudy/bazel,safarmer/bazel,juhalindfors/bazel-patches,dslomov/bazel-windows,variac/bazel,dslomov/bazel-windows,akira-baruah/bazel,aehlig/bazel,mrdomino/bazel,abergmeier-dsfishlabs/bazel,mikelikespie/bazel,katre/bazel,meteorcloudy/bazel,meteorcloudy/bazel,zhexuany/bazel,ButterflyNetwork/bazel,safarmer/bazel,abergmeier-dsfishlabs/bazel,mikelikespie/bazel,safarmer/bazel,dropbox/bazel,dslomov/bazel-windows,spxtr/bazel,mbrukman/bazel,dropbox/bazel,mrdomino/bazel,kchodorow/bazel-1,mbrukman/bazel,meteorcloudy/bazel,davidzchen/bazel,LuminateWireless/bazel,twitter-forks/bazel,anupcshan/bazel,kchodorow/bazel,ulfjack/bazel,hermione521/bazel,perezd/bazel,UrbanCompass/bazel,juhalindfors/bazel-patches,mikelalcon/bazel,mrdomino/bazel,spxtr/bazel,variac/bazel,spxtr/bazel,ulfjack/bazel,cushon/bazel,anupcshan/bazel,ulfjack/bazel,akira-baruah/bazel,whuwxl/bazel,hermione521/bazel,UrbanCompass/bazel,anupcshan/bazel,UrbanCompass/bazel,kchodorow/bazel-1,aehlig/bazel,juhalindfors/bazel-patches,dslomov/bazel,dslomov/bazel,whuwxl/bazel,kchodorow/bazel,werkt/bazel,juhalindfors/bazel-patches,UrbanCompass/bazel,dslomov/bazel,aehlig/bazel,juhalindfors/bazel-patches,anupcshan/bazel,dropbox/bazel,LuminateWireless/bazel,damienmg/bazel,kchodorow/bazel,mbrukman/bazel,akira-baruah/bazel,mbrukman/bazel,LuminateWireless/bazel,anupcshan/bazel,ulfjack/bazel,ButterflyNetwork/bazel,dslomov/bazel-windows,mikelikespie/bazel,damienmg/bazel,kchodorow/bazel,spxtr/bazel,kchodorow/bazel,abergmeier-dsfishlabs/bazel,twitter-forks/bazel,perezd/bazel,variac/bazel,werkt/bazel,iamthearm/bazel,iamthearm/bazel,mbrukman/bazel,spxtr/bazel,juhalindfors/bazel-patches,zhexuany/bazel,bazelbuild/bazel,dslomov/bazel,kchodorow/bazel-1,Asana/bazel,mikelalcon/bazel,bazelbuild/bazel,iamthearm/bazel,twitter-forks/bazel,bazelbuild/bazel,dropbox/bazel,mikelikespie/bazel,katre/bazel,mikelikespie/bazel,abergmeier-dsfishlabs/bazel,variac/bazel,aehlig/bazel,damienmg/bazel,spxtr/bazel,katre/bazel,whuwxl/bazel,werkt/bazel,spxtr/bazel,variac/bazel,perezd/bazel,cushon/bazel,Asana/bazel,katre/bazel,davidzchen/bazel,Asana/bazel,kchodorow/bazel-1,katre/bazel,iamthearm/bazel,davidzchen/bazel,twitter-forks/bazel,akira-baruah/bazel,snnn/bazel,snnn/bazel,damienmg/bazel,dropbox/bazel,UrbanCompass/bazel,mrdomino/bazel,akira-baruah/bazel,davidzchen/bazel,twitter-forks/bazel,cushon/bazel,kchodorow/bazel-1,LuminateWireless/bazel,abergmeier-dsfishlabs/bazel,mbrukman/bazel,katre/bazel,cushon/bazel,damienmg/bazel,zhexuany/bazel,LuminateWireless/bazel,mikelalcon/bazel,safarmer/bazel,abergmeier-dsfishlabs/bazel,whuwxl/bazel,dslomov/bazel,ButterflyNetwork/bazel,Asana/bazel,kchodorow/bazel-1,meteorcloudy/bazel,hermione521/bazel,UrbanCompass/bazel,mrdomino/bazel,meteorcloudy/bazel,zhexuany/bazel,twitter-forks/bazel,davidzchen/bazel,bazelbuild/bazel,meteorcloudy/bazel,bazelbuild/bazel,mikelalcon/bazel,anupcshan/bazel,ulfjack/bazel,perezd/bazel,dslomov/bazel,snnn/bazel,werkt/bazel,hermione521/bazel,hermione521/bazel,dslomov/bazel-windows,Asana/bazel,cushon/bazel,iamthearm/bazel,dropbox/bazel,ButterflyNetwork/bazel,damienmg/bazel,ButterflyNetwork/bazel,dslomov/bazel-windows,ButterflyNetwork/bazel,safarmer/bazel,snnn/bazel,ulfjack/bazel,zhexuany/bazel,werkt/bazel,kchodorow/bazel,snnn/bazel,snnn/bazel,aehlig/bazel,iamthearm/bazel,kchodorow/bazel,zhexuany/bazel,mrdomino/bazel,mikelalcon/bazel,perezd/bazel,snnn/bazel,perezd/bazel,davidzchen/bazel,dslomov/bazel,juhalindfors/bazel-patches,davidzchen/bazel