merge this fix from 2.1-dev:

*) Unix: Handle permissions settings for flock-based mutexes in
     unixd_set_global|proc_mutex_perms().  Allow the functions to be
     called for any type of mutex.  PR 20312

Reviewed by:	Justin, Greg


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@101246 13f79535-47bb-0310-9956-ffa450edef68