Fix .pdb file installation mixup:

* apr-1.pdb wasn't installed (should have been in PREFIX/lib)
* libapr-1.pdb was incorrectly installed to PREFIX/lib, in addition to 
  its correct location, PREFIX/bin

This issue did not exist in trunk.


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.5.x@1548236 13f79535-47bb-0310-9956-ffa450edef68