subversion: fix svn-tools warning

Fix the warning that the directory `svn-tools` is placed into bin, where non-executables are not supposed to be.
So I made a tiny little patch to change the svn-tools install path from `bin` to `libexec`, as suggested previously.
Symlinks are not necessary, I guess and it's easier to always apply both patches, also without the perl option. Won't hurt... Or would you like that to be separated?