deal with process-1.2.0.0 throwing an exception when program DNE (may only fix the tip of the iceberg)

Configure crashed on systems with that process and without eg, sha256sum.

The rest of the code in configure looks to work ok, since it uses sh -c to
probe for commands, and sh is always in path so it works.

Dunno about all the rest of git-annex. Not a huge amount of external
program use, other than git, so perhaps this won't be a large pain.

Note that boolSystem can throw an exception now if the program doesn't
exist. Could easily be changed back to False.

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