[GHC] #10636: Clear up difference between `WayDyn` and `Opt_Static`

[GHC]

#10636: Clear up difference between `WayDyn` and `Opt_Static`
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              Reporter:  thomie      |             Owner:
                  Type:  task        |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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 There are currently 2 different ways to test for a static or dynamic
 build:

 1. Test if `WayDyn` is in `ways`
 2. Test if `Opt_Static` is set

 Unless there's a use-case for setting `WayDyn`/`Opt_Static` inconsistently
 (if so, please add a `Note` somewhere), it should be possible to replace
 all queries of `Opt_Static` with an equivalent query of `WayDyn`. That
 would have prevented bug #8294.

 See the comments in Phab:D1017.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10636>
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