subversion: install svnmucc and other svn tools

Some useful tools can be installed through 'make install-tools'. Among
them, the following five binaries have filenames with the prefix 'svn',
and won't conflict with binaries form other packages. So it's safe to
install these tools by default.

 * svn-populate-node-origins-index
 * svn-rep-sharing-stats
 * svnauthz-validate
 * svnmucc
 * svnraisetreeconflict

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>