maint: numfmt.c: avoid a shadowing warning

[Jim Meyering]

Here's another change required to make --enable-gcc-warnings
work with systems that use gnulib's getopt replacement:

    * src/numfmt.c (parse_field_arg): Rename parameter s/optarg/arg/,
    to avoid shadowing getopt's global variable.
    Otherwise, building on OS X, with --enable-gcc-warnings, I saw this:

      In file included from src/numfmt.c:19:0:
      src/numfmt.c: In function 'parse_field_arg':
      ./lib/config.h:3109:25: error: declaration of 'rpl_optarg' shadows\
        a global declaration [-Werror=shadow]

0001-build-numfmt.c-avoid-a-shadowing-warning.patch
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