[WIP] Make output scripts executable by default when targeting node

[sbc100]

This is something we already did autoconf mode.

[kripken]

Is this motivated by something specific?

Also, does it work with JS minification - wouldn't that strip the added line? (in autoconf maybe we don't optimize anyhow and it's fine, but in general I'm not sure)

[sbc100]

Is this motivated by something specific?

Also, does it work with JS minification - wouldn't that strip the added line? (in autoconf maybe we don't optimize anyhow and it's fine, but in general I'm not sure)

I'm going to rethink this. Abandoning for now. The main motivations here are convenience (for folks like me who are lazy), and compatibility with normal toolchains (that produce executable content by default).

My alternative apprpach I think this is to continue to output a.out.js and then output a.out alongside it, where a.out is just a one line launcher for a.out.js.