Remove obsolete SVN_RA_SERF__WC_ACTIVITY_URL, and then fold SVN_RA_SERF__WC_NAMESPACE into the CHECKED_IN dav prop.
Remove obsolete SVN_RA_SERF__WC_ACTIVITY_URL, and then fold
SVN_RA_SERF__WC_NAMESPACE into the CHECKED_IN dav prop.

No functional change.

* subversion/libsvn_ra_serf/ra_serf.h:
  (SVN_RA_SERF__WC_NAMESPACE): removed
  (SVN_RA_SERF__WC_ACTIVITY_URL): obsolete/unused. removed.
  (SVN_RA_SERF__WC_CHECKED_IN_URL): rejigger components

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion