RFR: JDK-8232748: Build static versions of certain JDK libraries

[Erik Joelsson]

Certain downstream consumers of the JDK need to link to parts of it 
statically. To support this usecase, this patch adds a set of optional 
make targets that produce static native libraries for a selection of 
modules. These static libraries do not end up in the main JDK 
distribution but are instead packaged in a separate bundle that can be 
optionally overlayed on top of a JDK bundle. The new targets are only 
built when requested and are not added as dependencies on any existing 
target.

Webrev: http://cr.openjdk.java.net/~erikj/8232748/webrev.01
Bug: https://bugs.openjdk.java.net/browse/JDK-8232748

/Erik