Generate etags consistently across 32-bit and 64-bit platforms:

* modules/http/http_etag.c (etag_uint64_to_hex): Renamed from
etag_ulong_to_hex; take an apr_uint64_t argument.
(ap_make_etag): Adjust to use new function and macro names.
Pass arguments directly to etag_uint64_to_hex without casting
down to unsigned long.

PR: 40064


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@517238 13f79535-47bb-0310-9956-ffa450edef68