new package: netcat-openbsd

Closes https://github.com/termux/termux-packages/issues/5754.

packages/netcat-openbsd/build.sh

@@ -0,0 +1,39 @@
+TERMUX_PKG_HOMEPAGE=https://packages.debian.org/sid/netcat-openbsd
+TERMUX_PKG_DESCRIPTION="TCP/IP swiss army knife. OpenBSD variant."
+TERMUX_PKG_LICENSE="BSD"
+TERMUX_PKG_VERSION=1.217-2
+TERMUX_PKG_SRCURL=https://salsa.debian.org/debian/netcat-openbsd/-/archive/debian/${TERMUX_PKG_VERSION}/netcat-openbsd-debian-${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_SHA256=bb6427c49015c8d485c013898b08808192bf5719c40a79676162e5c2d971a34e
+TERMUX_PKG_DEPENDS="libbsd"
+TERMUX_PKG_CONFLICTS="netcat"
+TERMUX_PKG_BUILD_IN_SRC=true
+
+termux_step_pre_configure() {
+	local p
+	for p in $(cat debian/patches/series); do
+		echo "Applying debian/patches/$p"
+		patch -p1 -i debian/patches/$p
+	done
+
+	sed -i -e 's@-lresolv@@g' \
+		-e 's@CFLAGS=@CFLAGS?=@g' \
+		Makefile
+
+	CFLAGS+=" $CPPFLAGS"
+}
+
+termux_step_make_install() {
+	install -Dm700 nc $TERMUX_PREFIX/bin/netcat-openbsd
+	ln -sfr $TERMUX_PREFIX/bin/netcat-openbsd $TERMUX_PREFIX/bin/netcat
+	ln -sfr $TERMUX_PREFIX/bin/netcat-openbsd $TERMUX_PREFIX/bin/nc
+	install -Dm600 nc.1 $TERMUX_PREFIX/share/man/man1/netcat-openbsd.1
+	ln -sfr $TERMUX_PREFIX/share/man/man1/netcat-openbsd.1 \
+		$TERMUX_PREFIX/share/man/man1/netcat.1
+	ln -sfr $TERMUX_PREFIX/share/man/man1/netcat-openbsd.1 \
+		$TERMUX_PREFIX/share/man/man1/nc.1
+}
+
+termux_step_install_license() {
+	mkdir -p $TERMUX_PREFIX/share/doc/netcat-openbsd
+	head -n28 netcat.c | tail -n+2 > $TERMUX_PREFIX/share/doc/netcat-openbsd/LICENSE
+}

packages/netcat-openbsd/debian-patches-port-to-linux-with-libsd.patch

@@ -0,0 +1,12 @@
+diff -uNr netcat-openbsd-debian-1.217-2/debian/patches/port-to-linux-with-libsd.patch netcat-openbsd-debian-1.217-2.mod/debian/patches/port-to-linux-with-libsd.patch
+--- netcat-openbsd-debian-1.217-2/debian/patches/port-to-linux-with-libsd.patch	2020-06-05 04:20:03.000000000 +0300
++++ netcat-openbsd-debian-1.217-2.mod/debian/patches/port-to-linux-with-libsd.patch	2020-10-02 22:09:45.573193613 +0300
+@@ -68,7 +68,7 @@
+ +# include <linux/in6.h>
+ +#endif
+ +
+-+#ifndef IPTOS_LOWDELAY
+++#ifdef __ANDROID__
+ +# define IPTOS_LOWDELAY 0x10
+ +# define IPTOS_THROUGHPUT 0x08
+ +# define IPTOS_RELIABILITY 0x04