Support for options in valgrind-tests

[Reuben Thomas]

Another day, another nice surprise from gnulib: it supports valgrind,
so I can remove my own code for that...only, no I can't, because I add
options (I add --error-exitcode=1 --leak-check=full).

So, two alternative suggestions:

1. Agree that these options are must-haves (rationale: one's code
shouldn't leak memory, so turn on full leak checking to make sure;
tests that cause valgrind errors should count as failures).

2. Add the possibility for options somehow. Is there a standard way in
which like things are achieved? I would imagine setting VALGRIND to
"VALGRIND -q \$(VALGRIND_OPTIONS)" so then I can just set
VALGRIND_OPTIONS in Makefile.am if I want to pass options, but maybe
that's a bad approach.

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