DEB pytdeextensions: Make sure that python binary exists for packages that still depend on python2.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 02bd2a08c3)

dilos/libraries/pytdeextensions/debian/rules

@@ -33,6 +33,12 @@ DEB_CONFIGURE_EXTRA_FLAGS := --prefix=/usr --with-extra-libs=/usr/lib/$(DEB_HOST
 DEB_DH_BUILDDEB_ARGS += -- -Z$(shell dpkg-deb --help | grep -q ":.* xz[,.]" \
                                && echo xz || echo bzip2)
 
+post-patches::
+	# make sure that python binary exists
+	# since the existing code is still dependent on python2
+	# and cdbs uses python as the default binary name
+	test -x /usr/bin/python || ln -s python2 /usr/bin/python
+
 install/pytdeextensions-trinity::
 	# We have no idea if the built product is site-packages or dist-packages
 	cd debian/tmp/usr/lib/python*/ && mv site-packages/ dist-packages/ || echo "site-packages --> dist-packages"