Windows, bootstrapping: fix bootstrap_test
Windows, bootstrapping: fix bootstrap_test

Compute the --host_jvm_args for the
bazel.windows_unix_root JVM flag on Windows.
After commit
9c54e2a764f0ddd2d3787aade1c530c5f43bd26c it's the
Bazel client's job to compute this JVM flag and
pass to the server, but during bootstrapping we
run Bazel in a client-less mode.

Fixes https://github.com/bazelbuild/bazel/issues/3186

Change-Id: I2facfdef7d301d8a96213b488728e3ae6aec1c33
PiperOrigin-RevId: 158972256

bazelbuild/bazel,akira-baruah/bazel,variac/bazel,dropbox/bazel,spxtr/bazel,akira-baruah/bazel,perezd/bazel,dslomov/bazel,aehlig/bazel,davidzchen/bazel,meteorcloudy/bazel,perezd/bazel,dslomov/bazel,davidzchen/bazel,cushon/bazel,snnn/bazel,aehlig/bazel,werkt/bazel,variac/bazel,ulfjack/bazel,cushon/bazel,ulfjack/bazel,safarmer/bazel,damienmg/bazel,spxtr/bazel,safarmer/bazel,aehlig/bazel,dslomov/bazel,katre/bazel,werkt/bazel,werkt/bazel,twitter-forks/bazel,meteorcloudy/bazel,twitter-forks/bazel,dropbox/bazel,dslomov/bazel-windows,perezd/bazel,dslomov/bazel,dropbox/bazel,perezd/bazel,damienmg/bazel,dropbox/bazel,spxtr/bazel,dslomov/bazel-windows,damienmg/bazel,damienmg/bazel,damienmg/bazel,werkt/bazel,dslomov/bazel-windows,twitter-forks/bazel,twitter-forks/bazel,aehlig/bazel,ButterflyNetwork/bazel,akira-baruah/bazel,ButterflyNetwork/bazel,snnn/bazel,perezd/bazel,davidzchen/bazel,safarmer/bazel,dslomov/bazel,cushon/bazel,safarmer/bazel,katre/bazel,aehlig/bazel,davidzchen/bazel,twitter-forks/bazel,ButterflyNetwork/bazel,dropbox/bazel,akira-baruah/bazel,snnn/bazel,katre/bazel,akira-baruah/bazel,davidzchen/bazel,spxtr/bazel,ulfjack/bazel,variac/bazel,meteorcloudy/bazel,bazelbuild/bazel,damienmg/bazel,dropbox/bazel,meteorcloudy/bazel,katre/bazel,perezd/bazel,snnn/bazel,snnn/bazel,bazelbuild/bazel,variac/bazel,ButterflyNetwork/bazel,aehlig/bazel,dslomov/bazel-windows,werkt/bazel,twitter-forks/bazel,twitter-forks/bazel,davidzchen/bazel,bazelbuild/bazel,ButterflyNetwork/bazel,spxtr/bazel,meteorcloudy/bazel,cushon/bazel,werkt/bazel,bazelbuild/bazel,meteorcloudy/bazel,akira-baruah/bazel,dslomov/bazel,ulfjack/bazel,ulfjack/bazel,cushon/bazel,snnn/bazel,dslomov/bazel,ulfjack/bazel,spxtr/bazel,cushon/bazel,dslomov/bazel-windows,safarmer/bazel,perezd/bazel,variac/bazel,meteorcloudy/bazel,katre/bazel,variac/bazel,dslomov/bazel-windows,davidzchen/bazel,ButterflyNetwork/bazel,variac/bazel,safarmer/bazel,spxtr/bazel,aehlig/bazel,snnn/bazel,ulfjack/bazel,damienmg/bazel,katre/bazel,bazelbuild/bazel