Fix non-source layout APR include paths on Windows.

APR builds on Windows (both CMake- and the old Makefile.win-based) do not
install include files in $PREFIX/include/apr-1 but just in $PREFIX/include.

* SConstruct: Omit the '.../apr-1' directory from APR and APR-Util include
   paths on Windows.

git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1833230 13f79535-47bb-0310-9956-ffa450edef68
1 file changed