Grab trunk r1082250:

mpm_common.h: Add prototype for initgroups()

Submitted by: fuankg
Reviewed by: wrowe, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1092235 13f79535-47bb-0310-9956-ffa450edef68