bug#14644: emacsclient.c fails to compile

[Glenn Morris]

(Idle speculation) I wonder if this issue happens if:

1) you build Emacs with a system where the system getopt is not good
enough for some reason, so libgnu.a gets a getopt compat definition
compiled in.

2) you update your system and get a new glibc, so that system getopt is
now "good enough"

3) you rebuild Emacs without deleting lib/libgnu.a.