Makefile.svn: Optionally allow building with threading support
Makefile.svn: Optionally allow building with threading support

* tools/dev/unix-build/Makefile.svn: Add new THREADING variable to
  control whether APR and Sqlite should be built with threading
  support.

Approved by: stsp


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1040959 13f79535-47bb-0310-9956-ffa450edef68

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