[bug-patch] four maint and test nit-fixing patches:

[Jim Meyering]

Hi,
It's been a while since I looked at upstream patch.
I built with gcc-6.1 and ensured that "make distcheck" now passes.
Here's what I had to change (the gnulib update-to-latest) may not be
officially required, but is worthwhile anyhow, since it's been so long
since the last update):

[PATCH 1/4] gnulib: update to latest
[PATCH 2/4] maint: avoid new warning-errors from gcc-6.1
[PATCH 3/4] maint: placate a "make syntax-check" rule
[PATCH 4/4] tests: use $PATCH rather than hard-coded path

maint-and-test-nits.diff
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