[PATCH] Add cross-compilation support

[Thierry Reding]

The following patch adds rudimentary support for cross-compiling IcedTea 7.
This only works for non-bootstrapped builds. I've also tested building IcedTea
natively and it still works fine with this patch. The cross-compile was done
with an ARM target, but I currently have no hardware to test this on. I may
be able to runtime test the cross-compile on an i686 target later this week.

Cross-compiling also requires a native build of IcedTea/OpenJDK, so you need
to pass --with-jdk-home=/path/to/icedtea/or/openjdk and --disable-bootstrap
for this to work. I have also not tested cross-building the plugin yet.

Cheers,
Thierry
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