This should fix test failures that were being caused by golang/go#24570,
which caused test binaries to be built even when there are no test
files. The poor interaction there arose from the setting of flags in our
init() function, it seems.
There is no reason to run go env at variable expansion time, run it at
initialization time instead.
Also remove extra quoting for SHELL, as those are kept verbatim in the $(shell)
calls, which can lead to the attempted execution of a "/bin/bash" process
depending on the system, leading to errors like:
make: "/bin/bash": Command not found
It is turned off by default and can only be
enabled by changing the code and doing a new build. This will help us
test out the new feature without a long-term branch.
sam boyer
Yann Hodique
Benjamin Yolken
Matt Braymer-Hayes
stanguturi
Carolyn Van Slyck