[PATCH] doc, Add java cross compiler instructions

[David Daney]

This patch adds information I gained about building java cross compilers 
to the install documentation.

OK to commit?

:ADDPATCH doc:

2007-05-16  David Daney  <ddaney@avtrex.com>

    * doc/install.texi (Building a cross compiler): Add requirements
    for java cross compiler.

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