Revert "Make configure test exit code rather than output"

This reverts commit 5b718b5db4f848e68761adad23c4919b5076fa0a.

While I'm still of the opinion the configure script should be using true
and false instead of 1 and 0; the distcc issue is fixed upstream.

It turns out the reason they check the output is that they have to
support some badly behaved C compilers that don't use the return code to
indicate failure to compile.

Upstream now has a check and if it is well behaved it uses the return
code, which would fix the issue we had with distcc, if we were still
using it.

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