Force all Apache functions to be linked into the executable, whether they are used or not. This uses the same mechanism that is used for APR and APR-util. This may not be the correct solution, but it works, and that is what I really care about. This also renames CHARSET_EBCDIC to AP_CHARSET_EBCDIC. This is for namespace correctness, but it also makes the exports script a bit easier.
Allow modules to specify the first module for a sub-request. This allows modules to not have to muck with the output_filter after it creates the sub-request. Without this change, modules that create a sub-request have to manually edit the output_filters, and therefore skip the sub-request output_filter. If they skip the sub-request output_filter, then we end up sending multiple EOS buckets to the core_output_filter.