[Bug-librejs] patch to support non-standard installs

[Brandon Invergo]

Hi,

I'm the maintainer of GSRC (GNU Source Release Collection), which uses
Makefile trickery to install GNU software from source, usually to a
non-standard location (i.e. /gnu or ~/gnu instead of /usr).

I've attached a patch for the LibreJS Makefile to better support installing
to non-standard locations through the addition of the DESTDIR, prefix
and libdir variables. 

It also replaces the calls to mkdir with install -d, for the odd occasion
in which the user is installing the plugin when the $(libdir)/mozilla
directory doesn't exist due to the user not having a Mozilla-based
browser installed yet.

I've tested this against the just-released librejs 4.9, but since it's
not really interfering with the code, I can't imagine that it will fail
on the latest repo trunk. Nevertheless, if you would prefer that I patch
against that, let me know.

Cheers,
Brandon Invergo

ps - I'm not subscribed to the list so please CC me in your response
pps - Thanks for this great plugin!

librejs-4.9-alt_install.diff
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