Merge r1535610 from trunk:

 * r1535610
   Filter out -no-cpp-precomp from flags passed to SWIG.
   Justification:
     Fixing swig bindings on OS X when used with the majority of the APR
     versions that incorrectly include this in their --cppflags output.
   Votes:
     +1: breser, philip, brane
     +0: rhuijben (looks good, untested)


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1566500 13f79535-47bb-0310-9956-ffa450edef68