archivers/zip: grab maintainership

This one is too important to stay unmaintained.

While we are at it, silence bogus warnings -- the code base is in K&R
C and missing prototypes on function definitions are to be expected.

archivers/zip/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	zip
 PORTVERSION=	3.0
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	archivers
 MASTER_SITES=	SF/info${PORTNAME}/Zip%203.x%20%28latest%29/${PORTVERSION}
 DISTNAME=	${PORTNAME}${PORTVERSION:S/.//g}
@@ -19,6 +19,8 @@ CPE_VENDOR=	info-zip_project
 
 OPTIONS_DEFINE=	DOCS
 
+CFLAGS+=	-Wno-deprecated-non-prototype
+
 MAKE_ARGS=	CC="${CC}" CFLAGS="${CFLAGS}"
 MAKEFILE=	unix/Makefile
 ALL_TARGET=	generic