There are a few reasons why capturing the output of the RunTest builder
is undesirable:

 * there is a large amount of output which then gets unnecessarily
   duplicated by Hadrian if the builder fails

 * the output may contain codepoints which are unrepresentable in the
   current codepage on Windows, causing Hadrian to crash

 * capturing the output causes the testsuite driver to disable
   its colorisation logic, making the output less legible.