Joel Cunningham b28e979739 unit: write out XML file
This writes out the results of the unit tests in an XML file called
lwip_unittests.xml in the same directory as the unittests executable.

See https://libcheck.github.io/check/doc/check_html/check_4.html#XML-Logging
for an example of the ouput. Of particular use is the duration field, for
each test and for the entire test run.
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