gettext.m4 needs tweaking for bfd not having po/POTFILES.in

[Hans-Peter Nilsson]

Just some public FIXME note, hoping someone will beat me to a
patch.  It's nothing fatal (except perhaps to i18n support), but
I noticed an annoying
<toplevel>/bfd/configure: <toplevel>/binutils/bfd/po/POTFILES.in: No such file or directory.
which seems to be caused by CY_GNU_GETTEXT, which is called in
bfd/configure.in.  CY_GNU_GETTEXT is defined in
<toplevel>/gettext.m4 and assumes that in a subdir where there's
a po, there will be a po/POTFILES.in.  This recently changed for
bfd.

brgds, H-P