In CMake, check for thousands-grouping support in the GLib printf routines.

We do that with the autotools; do it with CMake as well.

We could, in theory, handle thosands-grouping ourselves, on all
platforms supporting ANSI C (for which read "all platforms we care
about") by using localeconv()'s thousands_sep and grouping items, but
that's a bit more work.

Fix autotools' comment for that item while we're at it (it checks the
GLib printf routines, not the system printf routines).

Change-Id: I000f0f3b955d9b192ade15e3fabc46d6b48a052e
Reviewed-on: https://code.wireshark.org/review/6317
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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