[PATCH] gnu.scm: add syntatic sugar macros for use-modules of packages, services, and system in the OS EDSL.

[jgrant]

These macros allow for nicer and more condensed loading of package, 
service, and system modules in the OS EDSL. For an example of this, 
please take a look of the sample-os-config.scm (above the commented-out 
line).

I want to thank davexunit for his influence on this , this will be my 
first non-package recipe config. :^)

As always, if you see something blatantly astray don't be shy to poke 
the ol' bootay.

Thanks & Regards.
- JGrant.

0001-PATCH-gnu.scm-add-syntactic-sugar-macros-for-use-mod.patch
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sample-os-config.scm
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