Fix remaining part of Issue 3453: Building Subversion 1.6 requires GNU grep 2.5.
Fix remaining part of Issue 3453: Building Subversion 1.6 requires GNU grep 2.5.

* build/ac-macros/kwallet.m4
  (SVN_LIB_KWALLET): Don't use the -o option of grep.

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