Merge r1530988 from trunk:

Axe some redundancy with specification of generated apr.h
as a dependency of the various binaries.

Pointed out by: Mike Rumph


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.5.x@1531280 13f79535-47bb-0310-9956-ffa450edef68