Merge r1543399 from trunk:

Make DLL_NAME definition compatible with Visual Studio generators by removing unnecessary
escaped quoting.

Diagnosis and earlier patch by rhuijben


git-svn-id: https://svn.apache.org/repos/asf/apr/apr-util/branches/1.5.x@1543401 13f79535-47bb-0310-9956-ffa450edef68