Merged revision(s) 1242858 from perl/modperl/branches/threading:
- introduce a few preprocessor macros aiming at a more robust interpreter
  handling (not finished yet).
- deleting some cruft from ancient perl versions.


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git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/branches/httpd24threading@1537775 13f79535-47bb-0310-9956-ffa450edef68