FYI: [PATCH] vasnprintf.c: avoid spurious warning from GCC 7

[Jim Meyering]

I want to build with bleeding edge GCC 7, and the following was
getting in my way, so I've just pushed the attached patch:

[PATCH] vasnprintf.c: avoid spurious warning from GCC 7

The presence of cpp directives renders this "FALLTHROUGH" comment
ineffective, so does not suppress the -Wimplicit-fallthrough warning
from GCC 7 built from git on 2016-10-02.
* lib/vasnprintf.c (VASNPRINTF): Move comment down past two cpp
directives, so that it takes effect once again.  This is clearly
not a proper change, and I will revert it once this bug is fixed:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77817

gnulib-vasnprintf-vs--Wimplicit-fallthrough.diff
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