new package: libtorrent (#5260)

packages/libtorrent/build.sh

@@ -0,0 +1,18 @@
+TERMUX_PKG_HOMEPAGE=https://github.com/rakshasa/rtorrent/wiki
+TERMUX_PKG_DESCRIPTION="Libtorrent BitTorrent library"
+TERMUX_PKG_MAINTAINER="Krishna Kanhaiya @kcubeterm"
+TERMUX_PKG_LICENSE="GPL-2.0"
+TERMUX_PKG_VERSION=0.13.8
+TERMUX_PKG_SRCURL=https://github.com/rakshasa/libtorrent/archive/v${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_SHA256=0f6c2e7ffd3a1723ab47fdac785ec40f85c0a5b5a42c1d002272205b988be722
+TERMUX_PKG_DEPENDS="openssl, zlib"
+
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
+--enable-aligned=true
+--without-fastcgi
+--with-zlib=$TERMUX_PREFIX
+"
+
+termux_step_pre_configure() {
+	./autogen.sh
+}

packages/libtorrent/scripts-ax_check_zlib.m4.patch

@@ -0,0 +1,12 @@
+diff -uNr libtorrent-0.13.8/scripts/ax_check_zlib.m4 libtorrent-0.13.8.mod/scripts/ax_check_zlib.m4
+--- libtorrent-0.13.8/scripts/ax_check_zlib.m4	2019-07-19 14:38:12.000000000 +0300
++++ libtorrent-0.13.8.mod/scripts/ax_check_zlib.m4	2020-05-07 20:33:39.695941588 +0300
+@@ -70,7 +70,7 @@
+ # Handle user hints
+ #
+ [AC_MSG_CHECKING(if zlib is wanted)
+-zlib_places="/usr/local /usr /opt/local /sw"
++zlib_places="@TERMUX_PREFIX@"
+ AC_ARG_WITH([zlib],
+ [  --with-zlib=DIR         root directory path of zlib installation @<:@defaults to
+                           /usr/local or /usr if not found in /usr/local@:>@