Parallel builds of IcedTea/OpenJDK

[Andrew John Hughes]

The attach patch allows the ALT_PARALLEL_COMPILE_JOBS and
HOTSPOT_BUILD_JOBS options to be turned on for an IcedTea build using
--with-parallel-jobs=x where x is the number of jobs to use.  This
speeds up the build quite a bit on systems with more than one
processor.

I've tested a full bootstrap with this.  Okay to commit?

-- 
Andrew :-)

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