[AD] [LNX] environment variable for modules

[Peter Wang <tjaden@xxxxxxxxxx>]

The attached patch implements a feature suggested by George.
Currently, to use modules you have to install them into /usr/lib or
/usr/local/lib. This patch lets you specify a directory to look for
the modules in, via the environment variable ALLEGRO_MODULES.  For
security reasons, ALLEGRO_MODULES is not used if you are running as
root.

It's a late addition, but any objections?  Reply quick :)



Unrelatedly, should ALLEGRO_WIP_VERSION become ALLEGRO_REVISION (or
something like that)?  George said people are using it so we should
not rename it, but what about:

	#define ALLEGRO_REVISION  ALLEGRO_WIP_VERSION

Yes, it's a trivial issue :)

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