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 license is
selected is ok (tested on Ubuntu).
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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.