[patch] check for the `free' utility

[Matthias Klose]

openjdk uses the `free' utility to set the -Xmx parameter; if `free' cannot be
found, a minimum value of 384MB is assumed, which apparently is too small for
amd64 and results in miscompilation (which I see in crashes in swing
applications and the webplugin).

 - please apply the patch for icedtea.

 - please document the use of `free' in openjdk, document the need of
   the `procps' package as a build dependency for building openjdk on
   Debian/Ubuntu.

Matthias

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