[GHC] #1407: Add the ability to :set -l{foo} in .ghci files

[GHC]

#1407: Add the ability to :set -l{foo} in .ghci files
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        Reporter:  guest             |                Owner:  archblob
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:  7.10.3
       Component:  GHCi              |              Version:  6.6.1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D194
                                     |  Phab:D1310
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Comment (by archblob):

 Hello Phyx,
 Yes it covers it and I see that you have made it so that the old test
 still runs on linux.
 I'm of the opinion that we should also make the linux test against your
 custom lib so that we don't have any headaches in the future. I can do it,
 or you can do it after your patch lands, whatever is best for you, just
 let me know.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1407#comment:27>
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