net/ipsvd: fix pkg-fallout with LLVM15

./compile udpsvd.c
udpsvd.c:271:32: error: incompatible pointer to integer conversion passing 'gid_t[61]' (aka 'unsigned int[61]') to parameter of type 'unsigned long' [-Wint-conversion]
      bufnum[fmt_ulong(bufnum, ugid.gid)] =0;
                               ^~~~~~~~
and use ugid.gid[0], and -include unistd.h globally, to fix
several missing prototype warnings around execve.

Someone tell Gerrit Pape that this code needs some serious fixing
around type widths and prototypes.

Deprecate, unless the upstream fixes things, and expire end of 2023.

net/ipsvd/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	ipsvd
 PORTVERSION=	1.0.0
+PORTREVISION=	1
 CATEGORIES=	net
 MASTER_SITES=	http://smarden.org/ipsvd/
 
@@ -18,12 +19,16 @@ BROKEN_riscv64=		fails to install: Checking udpsvd... drop: unable to read from
 WRKSRC=		${WRKDIR}/net/${DISTNAME}
 ALL_TARGET=	default
 
+DEPRECATED=	bogus assumption of system type widths, likely crash-prone
+EXPIRATION_DATE=2023-12-31
+
 DOCS=		package/CHANGES package/COPYING package/README doc/*.html
 
 OPTIONS_DEFINE=	DOCS
+USE_CSTD=	c89
 
 do-configure:
-	@${ECHO_CMD} "${CC} ${CFLAGS}" > ${WRKSRC}/src/conf-cc
+	@${ECHO_CMD} "${CC} ${CFLAGS} -include unistd.h" > ${WRKSRC}/src/conf-cc
 	@${ECHO_CMD} "${CC} ${LDFLAGS}" > ${WRKSRC}/src/conf-ld
 	@${ECHO_CMD} "${LOCALBASE}/include/libdjbdns" \
 		> ${WRKSRC}/src/conf-djbdnsinc

net/ipsvd/files/patch-src_udpsvd.c

@@ -0,0 +1,11 @@
+--- src/udpsvd.c.orig	2008-06-15 20:31:14 UTC
++++ src/udpsvd.c
+@@ -268,7 +268,7 @@ int main(int argc, const char **argv, const char *cons
+     if (user) {
+       bufnum[fmt_ulong(bufnum, ugid.uid)] =0;
+       out(", uid "); out(bufnum);
+-      bufnum[fmt_ulong(bufnum, ugid.gid)] =0;
++      bufnum[fmt_ulong(bufnum, ugid.gid[0])] =0;
+       out(", gid "); out(bufnum);
+     }
+     flush(", starting.\n");