windows,client: fix error reporting #5072
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Fix error reporting in the path conversion methods
of the Bazel client. Previously the error
reporting logic used GetLastErrorString in places
where it was not appropriate (i.e. it was not a
failed Windows API call that caused an error).
This cleanup prepares removing the concept of the
MSYS root from the Bazel client, since MSYS paths
are no longer supported and we want to cut Bazel's
dependency on Bash (thus MSYS) completely.
See #4319
Change-Id: Ie50a20e0ee0c572592f637340a2f2948c7f53088