Merge r892435 from trunk:

    Please review;
    
    Unless the granularity is 4GB, there appears to be a truncation
    issue using 32 bit ints on a 64 bit memory architecture platform.

This removes some dubious casting in apr_pools.c by properly using
apr_size_t.



git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.6.x@1594719 13f79535-47bb-0310-9956-ffa450edef68