irc/unreal: fix inline which should be static

During an exp-run for llvm 13 (see bug 258209), it turned out that
irc/unreal fails to build with clang 13:

cc -I../include -I@TREINCDIR@ -I/wrkdirs/usr/ports/irc/unreal/work/Unreal3.2.10.7/extras/regexp/include -pipe -O2 -pipe -I/usr/local/include -fcommon -fstack-protector-strong -fno-strict-aliasing -funsigned-char -Wl,-export-dynamic -L/usr/local/lib -fstack-protector-strong -lssl -lcrypto -o ircd timesynch.o res.o s_bsd.o auth.o aln.o channel.o cloak.o crule.o dbuf.o events.o fdlist.o hash.o help.o ircd.o ircsprintf.o list.o lusers.o match.o modules.o packet.o parse.o s_auth.o s_conf.o s_debug.o s_err.o s_extra.o s_kline.o s_misc.o s_numeric.o s_serv.o s_svs.o socket.o ssl.o s_user.o charsys.o scache.o send.o support.o umodes.o version.o whowas.o zip.o cidr.o random.o extcmodes.o extbans.o md5.o api-isupport.o api-command.o -L/usr/local/lib -fstack-protector-strong -lcrypt /wrkdirs/usr/ports/irc/unreal/work/Unreal3.2.10.7/extras/regexp/lib/libtre.a -L/usr/local/lib -fstack-protector-strong -L/usr/local/lib -lcares -lssl -lcrypto
ld: error: undefined symbol: parse_addlag

referenced by parse.c

parse.o:(parse)

referenced by parse.c

parse.o:(parse)

cc: error: linker command failed with exit code 1 (use -v to see invocation)

• Error code 1

This is because parse_addlag() is marked as 'inline' but does not have
either 'static' or 'extern' specifiers. Add a 'static' specifier to
resolve the link error.

PR: 258472
Approved by: maintainer timeout (2 weeks)
MFH: 2021Q4