Hack to restore the build of APR::* modules. The httpd24threading branch now builds for me on Windows/VS2010 against httpd-2.4.4/perl-5.19.4 (default debugging mode build configurations).

git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/branches/httpd24threading@1538006 13f79535-47bb-0310-9956-ffa450edef68