rtorrent: remove manual autoconf invocation
The Makefile already uses the proper autoreconf fixup but leaves a manual
autoconf invocation in place.
The bad autoconf call leads to the following build error in the SDK:
( cd .../rtorrent-0.9.4-git; ./autogen.sh );
aclocal...
autoheader...
libtoolize... libtoolize nor glibtoolize not found
make[2]: *** [.../rtorrent-0.9.4-git/.configured_] Error 1
Remove the entire Build/Configure override to let rtorrent build correctly.
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>