windows: replace custom JunctionResolver
windows: replace custom JunctionResolver

There's a realpath(3)-like Windows API function
called GetFinalPathNameByHandle{A,W}.

This commit removes JunctionResolver, implements
RealPath using GetFinalPathNameByHandleW, and
replaces JunctionResolver usages with RealPath.

Change-Id: I69efd29c139e957a93496cd75a2db351ed4453e1
PiperOrigin-RevId: 186598195

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