RFR: JDK-8141590: Cannot build Zero with devkit

[Erik Joelsson]

This patch adds libffi to the linux devkit to enable building of zero. 
It also adds optional bundling of the libffi library with the JDK. The 
reason for this is that the devkit sysroot is based on a distro that 
uses libffi.so.5 while most distros we build or run tests on comes with 
libffi.so.6, and those are not compatible. Static linking was 
considered, but libffi.a doesn't seem commonly available where we would 
need it.

I'm also adding Jib profiles and a JPRT configuration which enables 
building of zero on Linux x86 and x64 for the "buildinfra" testset in 
JPRT. Note that these builds are currently not clean (for OracleJDK 
builds at least).

Bug: https://bugs.openjdk.java.net/browse/JDK-8141590

Webrev: http://cr.openjdk.java.net/~erikj/8141590/webrev.01/

/Erik