suexec.c wouldn't build without -DLOG_EXEC

Submitted by:	Jason A. Dour
Reviewed by:	Dean Gaudet, Randy Terbush, Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79305 13f79535-47bb-0310-9956-ffa450edef68