XtOffsetOf

[Doug MacEachern]

conflicts with php:
In file included from /home/dougm/ap/prefork/include/apr_buckets.h:61,
                 from /home/dougm/ap/prefork/include/util_filter.h:59,
                 from sapi_apache2.c:33:
/home/dougm/ap/prefork/include/apr_general.h:115:19: warning: "XtOffsetOf" 
redefined
/home/dougm/ap/php4/main/php.h:342:1: warning: this is the location of the 
previous definition

should probably be APR_OFFSET_OF or ?