Brad King f52b5ae3c4 cmSystemTools: Add callback for Stderr
Factor a common callback type out of StdoutCallback.  Add an equivalent
StderrCallback.  While at it, use "size_t" for the data length instead
of "int".

Teach "ctest --build-and-test" to capture the Stderr callback because
output sent through it is part of the logical CMake process output.
2014-05-15 10:26:30 -04:00
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