Use our own buffer for tmpnam() if the platform seems to know
	about it.  Avoids threading and reentrancy problems.

PR:		3945, 5253, 5383, 5558


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@85133 13f79535-47bb-0310-9956-ffa450edef68