new `GprofDir' directive when compiled with -DGPROF, where gprof can

plop gmon.out profile data for each child
PR:
Obtained from:
Submitted by:	Doug MacEachern
Reviewed by:	Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81961 13f79535-47bb-0310-9956-ffa450edef68