vpnc: change upstream to fork

fixes void-linux#26798.

* Changes upstream to https://github.com/streambinder/vpnc/. That's a fork
  that's a fork which is at least used in alpine.
* Depends on vpnc-scripts. New upstream doesn't ship those files anymore
* Add wrapper script to stay backwards compatible
* Switch to build_style=gnu-makefile instead of manually calling make.

srcpkgs/vpnc/files/vpnc-script

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec /usr/libexec/vpnc-scripts/vpnc-script "$@"

srcpkgs/vpnc/template

@@ -1,17 +1,22 @@
 # Template file for 'vpnc'
 pkgname=vpnc
 version=0.5.3
-revision=7
+revision=8
+_githash=43780cecd7a61668002f73b6f8b9f9ba61af74ad
+wrksrc="vpnc-$_githash"
+build_style=gnu-makefile
+make_use_env=yes
+make_build_args="SBINDIR=/usr/bin"
+make_check_target=test
 hostmakedepends="perl"
-makedepends="libgcrypt-devel"
-depends="net-tools"
+makedepends="libgcrypt-devel libressl-devel"
+depends="net-tools vpnc-scripts"
 short_desc="Client for cisco vpn concentrator"
 maintainer="Enno Boland <gottox@voidlinux.org>"
 license="GPL-2.0-or-later"
 homepage="https://www.unix-ag.uni-kl.de/~massar/vpnc/"
-distfiles="https://www.unix-ag.uni-kl.de/~massar/vpnc/vpnc-${version}.tar.gz"
-checksum=46cea3bd02f207c62c7c6f2f22133382602baeda1dc320747809e94881414884
-
+distfiles="https://github.com/streambinder/vpnc/archive/$_githash.tar.gz"
+checksum=473449da6be522eea43c2b16e6b2214d6ace49a2eac0a625405981193fc43170
 conf_files="
  /etc/vpnc/default.conf
  /etc/vpnc/vpnc-script"
@@ -20,14 +25,16 @@ if [ "$CROSS_BUILD" ]; then
 	hostmakedepends+=" vpnc"
 fi
 
-do_configure() {
+post_patch() {
+	vsed -e 's/^#OPENSSL/OPENSSL/' -i Makefile
+	vsed -e 's/^install:.*/install: install-common/' -i Makefile
+	vsed -e 's#^SBINDIR=.*#SBINDIR=/$(PREFIX)/bin#' -i Makefile
 	if [ "$CROSS_BUILD" ]; then
-		sed -i 's%^my \$vpnc = .*;%my \$vpnc = "/usr/bin/vpnc";%' makeman.pl
+		vsed -e 's%^my \$vpnc = .*;%my \$vpnc = "/usr/bin/vpnc";%' -i src/makeman.pl
 	fi
 }
-do_build() {
-	make CC=$CC ${makejobs}
-}
-do_install() {
-	make PREFIX=/usr SBINDIR=/usr/bin DESTDIR=${DESTDIR} install
+
+post_install() {
+	rm -r $DESTDIR/usr/lib/systemd/system
+	vinstall $FILESDIR/vpnc-script 755 etc/vpnc
 }