Reset timeout while reading via get_client_block() in mod_cgi.c

Fixes failed file transfer problems for _large_ files.
Reviewed by: Randy Terbush
Submitted by: Rasmus Lerdorf


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77289 13f79535-47bb-0310-9956-ffa450edef68