[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:  new
        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
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Comment (by thomie):

 Sounds good to me. See also the other tests in
 `testsuite/tests/ghci/linking/Makefile`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1407#comment:25>
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