https://bugzilla.mozilla.org/show_bug.cgi?id=841039
841039 - add a make target for the leaktest tests we run at build time from the objdir
RESOLVED (jmaher) in Testing - Mozbase. Last updated 2013-02-14.
https://sourceware.org/pipermail/cygwin-patches/2023q1/012126.html
[PATCH 1/8] Cygwin: testsuite: automake doesn't define objdir
patchcygwintestsuiteautomakedefine