RFR: JDK-8032217: failure in man page processing

[Erik Joelsson]

This is for jdk8 and is quite urgent. A problem with man page handling 
in certain (Oracle) build configurations was discovered following my 
last change in the area. This patch moves the remaining logic for closed 
man pages to the closed Images.gmk to keep it all in the same place. It 
also changes some := into = and moves the include point of the closed 
file to enable the needed overrides to work.

On a side note, making the open makefiles both clear, readable, 
effective and easily overridable is something I would like to address in 
9. This late in 8, we just need to make it work with minimal changes.

Webrev: http://cr.openjdk.java.net/~erikj/8032217/webrev.jdk.01/

/Erik