Clear up difference between `WayDyn` and `Opt_Static`

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 (closed).

See the comments in D1017.

Trac metadata

Trac field	Value
Version	7.10.1
Type	Task
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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