yahoojp.c is in POTFILES.in, but isn't actually use for the build.
This causes `make distcheck` to fail as the file isn't "distributed".
This patch adds yahoojp.c to EXTRA_DIST so it will be distributed
and successfully checked when generating the translation files.
Really this file could be removed, but the 2.x.y branch has all of
the Yahoo prpl removed and that will be merged here soon enough.
#!/usr/bin/env perl
#
# check_po.pl - check po file translations for likely errors
#
# Written by David W. Pfitzner dwp@mso.anu.edu.au
# This script is hereby placed in the Public Domain.
#
# Various checks on po file translations:
# - printf-style format strings;
# - differences in trailing newlines;
# - empty (non-fuzzy) msgid;
# - likely whitespace errors on joining multi-line entries
# Ignores all fuzzy entries.
#
# Options:
# -x Don't do standard checks above (eg, just check one of below).
# -n Check newlines within strings; ie, that have equal numbers
# of newlines in msgstr and msgid. (Optional because this may
# happen legitimately.)
# -w Check leading whitespace. Sometimes whitespace is simply
# spacing (eg, for widget labels etc), or punctuation differences,
# so this may be ok.
# -W Check trailing whitespace. See -w above.
# -p Check trailing punctuation.
# -c Check capitalization of first non-whitespace character
# (only if [a-zA-Z]).
# -e Check on empty (c.q. new) msgstr
#
# Reads stdin (or filename args, via <>), writes any problems to stdout.
#
# Modified by Davide Pagnin nightmare@freeciv.it to support plural forms
#
# Version: 0.41 (2002-06-06)
# TODO: This script needs to be able to handle Farsi's %Id flag for
# number format specifiers. More information on how it works, see