Use the proper enum for the block/non-block parameter to apr_bucket_read().

A couple of these changed in meaning (e.g., 1->APR_BLOCK_READ).

PR:		6980


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88428 13f79535-47bb-0310-9956-ffa450edef68