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Brad King authored
The VS IDE sets the environment variable VS_UNICODE_OUTPUT when executing build rules in order to tell MS tools to report output through a back door instead of through stdout/stderr. Unset this variable so that CMake can capture or properly redirect all output from processes it runs even when running inside a VS IDE build environment. This generalizes the special cases fixed by commit 80d045b0 (When GetPrerequisites.cmake runs dumpbin while running inside the VS IDE..., 2008-05-01) and commit 44aff73d (ExternalProject: Avoid bleed-through output when logging, 2011-01-06), so drop special handling of VS_UNICODE_OUTPUT in those instances.
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