net/echoping: keep up with changes

echping does not exist at SourceForge anymore.
Use distfile from Github and deal with differences:

- new distfile has no configure scripts but configure.ac
and requires generation of configure, but modern autoreconf
cannot handle its configure.ac files properly so they need
some polishing with pre-configure target to be useful;

- broad usage of HTTP Strict Transport Security
requires new patch fixing echoping's HTTP "accept_redirects" mode,
so this echoping does not fail in this mode on HTTP redirects;

- pet portlint;
- bump PORTREVISION.

net/echoping/Makefile

@@ -3,9 +3,8 @@
 
 PORTNAME=	echoping
 PORTVERSION=	6.0.2
-PORTREVISION=	5
+PORTREVISION=	6
 CATEGORIES=	net ipv6
-MASTER_SITES=	SF
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Ping-like program that uses TCP and/or HTTP
@@ -16,7 +15,8 @@ LICENSE_FILE=	${WRKSRC}/COPYING
 LIB_DEPENDS=	libpopt.so:devel/popt \
 		libidn.so:dns/libidn
 
-USES=		cpe libtool ssl
+USES=		autoreconf cpe libtool ssl
+
 CPE_VENDOR=	echoping_project
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--enable-http --enable-icp --enable-smtp --with-ssl \
@@ -26,6 +26,12 @@ INSTALL_TARGET=	install-strip
 
 PING_PLUGINS=	dns random whois
 
+USE_GITHUB=	yes
+GH_ACCOUNT=	bortzmeyer
+GH_PROJECT=	${PORTNAME}
+GH_TAGNAME=	dfe95b5
+WRKSRC=		${WRKDIR}/${PORTNAME}-${GH_TAGNAME}/SRC
+
 OPTIONS_DEFINE=	LDAP PGSQL
 OPTIONS_DEFAULT=LDAP
 OPTIONS_SUB=	yes
@@ -36,7 +42,11 @@ LDAP_VARS=	PING_PLUGINS+=ldap
 PGSQL_USES=	pgsql
 PGSQL_VARS=	PING_PLUGINS+=postgresql
 
-post-patch:
-	@${REINPLACE_CMD} '/^echoping_LDADD =/s/$$/ -lm/' ${WRKSRC}/Makefile.in
+pre-configure:
+	${FIND} ${WRKSRC} -name configure.ac -execdir ${SH} -c '\
+	  ${CAT} ${WRKSRC}/configure-common.ac > configure.ac.tmp && \
+	  ${SED} '/configure-common\.ac/d' configure.ac >> configure.ac.tmp && \
+	  ${MV} configure.ac.tmp configure.ac' \;
+	${REINPLACE_CMD} '/^echoping_LDADD =/s/$$/ -lm/' ${WRKSRC}/Makefile.am
 
 .include <bsd.port.mk>

net/echoping/distinfo

@@ -1,2 +1,3 @@
-SHA256 (echoping-6.0.2.tar.gz) = 1dfa4c45bf461b2379ff91773ed7136176e2abac9e85c26bc9654942b5155eac
-SIZE (echoping-6.0.2.tar.gz) = 1660983
+TIMESTAMP = 1559666517
+SHA256 (bortzmeyer-echoping-6.0.2-dfe95b5_GH0.tar.gz) = 712ec52f47281aac8e6121fa4e261df22360112221eb3615f4cfa22fb5efd0ce
+SIZE (bortzmeyer-echoping-6.0.2-dfe95b5_GH0.tar.gz) = 130632

net/echoping/files/patch-http.c

@@ -0,0 +1,11 @@
+--- http.c.orig	2015-06-03 13:06:16 UTC
++++ http.c
+@@ -113,6 +113,8 @@ read_from_server(CHANNEL fs, short ssl, 
+             /* 204 No Content is not an error, message body is empty by definition, see RFC 2616 */
+             if (reply_code == 204)
+                 return 0;       /* zero bytes is correct */
++             if (accept_redirects && reply_code >= 300 && reply_code < 400)
++		return 0;
+ 
+             if (!  (reply_code >= 200 && reply_code < 300) &&
+                 ! ((reply_code >= 300 && reply_code < 400) && accept_redirects))