Review Request: 8007450: Add build support for different man pages for OpenJDK and OracleJDK

[Erik Joelsson]

Open part of this review:

The docs team will start producing separate man pages for openjdk and 
oraclejdk. Here are the necessary changes to the makefiles to support this.

http://cr.openjdk.java.net/~erikj/8007450/webrev.jdk.01/

/Erik