new package: rdiff-backup

Requested in https://github.com/termux/termux-packages/issues/4091.

packages/rdiff-backup/build.sh

@@ -0,0 +1,17 @@
+TERMUX_PKG_HOMEPAGE=http://www.nongnu.org/rdiff-backup/
+TERMUX_PKG_DESCRIPTION="A utility for local/remote mirroring and incremental backups"
+TERMUX_PKG_LICENSE="GPL-2.0"
+TERMUX_PKG_VERSION=1.2.8
+TERMUX_PKG_SRCURL=https://savannah.nongnu.org/download/rdiff-backup/rdiff-backup-$TERMUX_PKG_VERSION.tar.gz
+TERMUX_PKG_SHA256=0d91a85b40949116fa8aaf15da165c34a2d15449b3cbe01c8026391310ac95db
+TERMUX_PKG_DEPENDS="librsync, python2"
+TERMUX_PKG_BUILD_IN_SRC=true
+
+termux_step_make_install() {
+	local _PYTHON_VERSION=2.7
+	export PYTHONPATH=$TERMUX_PREFIX/lib/python${_PYTHON_VERSION}/site-packages
+	export CPPFLAGS+=" -I${TERMUX_PREFIX}/include/python${_PYTHON_VERSION}"
+	export LDFLAGS+=" -lpython${_PYTHON_VERSION}"
+	export LDSHARED="$CC -shared"
+	python${_PYTHON_VERSION} setup.py install --prefix=$TERMUX_PREFIX --force
+}

packages/rdiff-backup/rdiff-backup-1.2.8-librsync-1.0.0.patch

@@ -0,0 +1,20 @@
+Patch by Roman Tereshonkov and Kari Hautio for rdiff-backup <= 1.2.8 to avoid a build failure with
+librsync >= 1.0.0 (which is a security bugfix release). The discussion and solution finding can be
+found at https://bugs.launchpad.net/duplicity/+bug/1416344 (for duplicity).
+
+--- rdiff-backup-1.2.8/_librsyncmodule.c			2009-03-16 15:36:21.000000000 +0100
++++ rdiff-backup-1.2.8/_librsyncmodule.c.librsync-1.0.0		2015-03-02 00:54:24.000000000 +0100
+@@ -59,8 +59,13 @@
+   if (sm == NULL) return NULL;
+   sm->x_attr = NULL;
+ 
++#ifdef RS_DEFAULT_STRONG_LEN
+   sm->sig_job = rs_sig_begin((size_t)blocklen,
+ 							 (size_t)RS_DEFAULT_STRONG_LEN);
++#else
++  sm->sig_job = rs_sig_begin((size_t)blocklen,
++							 (size_t)8, RS_MD4_SIG_MAGIC);
++#endif
+   return (PyObject*)sm;
+ }
+