Restore backwards compatibility of OPT_* handling in the fix for

CVE-2009-1195:

* include/http_core.h: Add back the OPT_INCNOEXEC and hide
  OPT_INC_WITH_EXEC as internal-only.

* server/core.c (ap_allow_options): Invert the returned
  OPT_INC_WITH_EXEC bit such that the exposed semantics of
  OPT_INCNOEXEC are retained.

* modules/filters/mod_include.c (includes_filter): Revert to using
  OPT_INCNOEXEC.

Submitted by: trawick, jorton
Reviewed by: jorton, trawick, rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@779472 13f79535-47bb-0310-9956-ffa450edef68