[winswitch] uglify-js dependence

[Antonio Trande]

Hi all.

Currently, `xpra` rpm provided by Fedora repositories requires
`uglify-js` during build time.
Since `uglify-js` needs many missing JS modules to be used, i wish to
drop `uglify-js` dependence but how does work `xpra` without `uglify-js`
support?

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Antonio Trande
Fedora Project
mailto 'sagitter at fedoraproject dot org'
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