Enable the ZRTP (encryption) option -- and bump PORTREVISION.

While here, arrange for the bundled mediastreamer2/ and oRTP/
subdirectories to not be extracted from the tarball -- we build
them separately from ports of their own anyway.

net/linphone/Makefile

@@ -2,7 +2,7 @@
 
 PORTNAME=	linphone
 PORTVERSION=	3.7.0
-PORTREVISION=	2
+PORTREVISION=	3
 PORTEPOCH=	1
 CATEGORIES=	net
 MASTER_SITES=	SAVANNAH/linphone/3.7.x/sources
@@ -21,6 +21,7 @@ CONFLICTS_INSTALL=	linphone-base-[0-9]*
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-deplibs-link --disable-strict --disable-tutorials \
 		--enable-external-mediastreamer --enable-external-ortp \
+		--enable-zrtp \
 		--with-readline=${LOCALBASE}
 CPPFLAGS+=	-I${LOCALBASE}/include
 LIBS+=		-L${LOCALBASE}/lib
@@ -28,6 +29,7 @@ INSTALL_TARGET=	install-strip
 USES=		gmake libtool pathfix pkgconfig readline:port
 USE_GNOME=	 gtk20 intltool libxml2
 USE_LDCONFIG=	yes
+EXTRACT_AFTER_ARGS+=--exclude mediastreamer2 --exclude oRTP
 
 OPTIONS_DEFINE=	IPV6 NLS NOTIFY UPNP VIDEO
 OPTIONS_DEFAULT=NOTIFY UPNP VIDEO