Move some globals into the constant data segment.
Move some globals into the constant data segment.

* subversion/libsvn_ra_serf/options.c:
  (capability_yes, capability_no, capability_server_yes): constify


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1334500 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion