RFR: JDK-8150601: Remove the old Hotspot build system

[Erik Joelsson]

The new Hotspot Build System has now been in place for a week and a 
half. I have not heard any major complaints so I think the time has come 
to remove the old. This patch removes all the old, now unused, makefiles 
in hotspot/make. It also removes the support for using these makefiles 
from configure and the top level make dir. Finally it moves all the new 
makefiles from hotspot/makefiles to hotspot/make.

With this change, we will be able to conclude JEP 284.
Bug: https://bugs.openjdk.java.net/browse/JDK-8150601
Webrev: http://cr.openjdk.java.net/~erikj/8150601/webrev.01/

/Erik