[Bug 258472] irc/unreal: fix build with clang 13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258472

            Bug ID: 258472
           Summary: irc/unreal: fix build with clang 13
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org

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.

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