Fix format string warnings in proxy_ajp on 64-bit platforms:

Fix format string warnings in proxy_ajp on 64-bit platforms:

* modules/proxy/ajp_header.c (ajp_send_data_msg): Use
APR_SIZE_T_FMT.

* modules/proxy/ajp_link.c (ajp_ilink_receive): Don't pass
\n to ap_log_error; do use APR_SIZE_T_FMT.

* modules/proxy/ajp_msg.c (ajp_msg_dump, ajp_msg_check_header,
ajp_msg_copy): Use APR_SIZE_T_FMT.
(ajp_log_overflow): New function.
(ajp_msg_{append,peek,get}_*): Use it.

* modules/proxy/proxy_ajp.c (ap_proxy_ajp_request): Use
APR_SIZE_T_FMT.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105071 13f79535-47bb-0310-9956-ffa450edef68