subversion: update to 1.6.20

This update fixes the following issues for subversion:
- bnc#796050 update to 1.6.20:
+ Client- and server-side bugfixes:
* Fix typos in pt_BR, es and zh_TW translations

+ Server-side bugfixes:
* add Vary: header to GET responses to improve cacheability
* fix fs_fs to cleanup after failed rep transmission
* fix an assert with SVNAutoVersioning in mod_dav_svn

Fixed bugs
bnc#796050
update Apache Subversion to 1.6.20 maintenance release
Selected Binaries
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