use maintainer-makefile for improved 'make syntax-check'

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I've been sitting on this for a while, because I still need to merge it to
the master branch.  But it's worth applying for branch-1.6, even before I
merge (in part because of Ralf's recent report which requires touching
gnulib-cache.m4 again, and rebasing across git submodules is still not the
easiest process).

- --
Don't work too hard, make some time for fun as well!

Eric Blake             [email protected]
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