(XS) Request for review: 7109092 - link changes for embedded builds

[David Holmes]

We need to make an adjustment to the link instructions used for libjava 
in embedded builds, as defined in Defs-embedded.gmk

webrev: http://cr.openjdk.java.net/~dholmes/7109092/webrev/

Summary: system soft-float libraries need not have the level of accuracy 
required by Java floating-point semantics. On those platforms we have a 
custom soft-float library to provide the necessary accuracy. This change 
updated the linker instructions to use that library when linking libjava 
(really fdlibm is what needs it).

The VM has been using a similar library for a while now.

I currently have this as a child of jdk8/tl/jdk so would prefer to push 
there, but can switch to jdk8/build/jdk if the build-dev folks feel 
strongly about it.

Thanks,
David