subversion: refactor do_configure

subversion: refactor do_configure

Upstream has an autogen.sh which constructs a hand-written aclocal.m4
and manually copies libtool into place. Instead of working around the
bad interaction between these expectations and our autotools class we
can just disable the execution of aclocal in autoreconf and copy files
as autogen.sh does.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>