Clean up attempts at detection of apr.
Clean up attempts at detection of apr.

ac-helpers/apr.m4:(SVN_LIB_APR): Quote a bunch of things for safety.  Also
  test for inequality using test not [ ].  It wasn't working (probbaly due
  to m4 quoting).

  (SVN_FIND_APR): Pass the necessary -I flag when testing for apr.h, also
  exit if we don't find it.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@840600 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion