Backport:

Distinguish properly between the bindir and sbindir directories when
installing binaries. Previously all binaries were silently installed to
sbindir, whether they were system administration commands or not.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1220867 13f79535-47bb-0310-9956-ffa450edef68