MM has a bug that when you ask for a specific amount of shared memory

it allocates just that amount.  But, MM actually uses some of it, so we
need to over allocate just a bit.  On 32 bit machines 40 bytes is enough,
but on a 64 bit machine it isn't.  So, we bump it up to 80 bytes until
MM fixes this bug.
Submitted by:	David Hill <David.D.Hill@compaq.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86916 13f79535-47bb-0310-9956-ffa450edef68