[oe] meta-java: Building openjre-8 on a non-gcc-6 host

[Jan Kiszka]

Hi all,

seems like the current cross rules for openjre-8 at least break if the
host compiler < gcc-6: -fno-lifetime-dse gets injected based on the
cross compiler version, which is 6, but is also used for the few native
pieces of that build.

Any suggestions how to fix that properly? I had to temporarily redirect
my default gcc from 4.8 to gcc-6.

Thanks,
Jan

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