WIP: eagle: new package

FIXME: Eagle insists on having write access to its bin/ directory on the
first startup, to select a license. Running read-only after the license
is selected is ok (tested on Ubuntu).

I have sent an email to CadSoft support asking for an envirnment
variable that overrides the license file location. Let's see how that
plays out.
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Eagle is a schematic capture and PCB layout program from CadSoft. This
is proprietary software and CadSoft provide a self-extracting shell
script with embedded tarball of the prebuilt application.

Add Eagle version 6.4.0.