[MacPorts] #62803: mpich: declare lib dependency on target compiler

[MacPorts]

#62803: mpich: declare lib dependency on target compiler
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 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  mpich
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 While the various mpich-* subports declare a build dependency on the
 target compiler, they do not declare a lib dependency for GCC subports.

 The implications are that:

 1. The target compiler will be installed for a source build, only to be
 uninstalled during a reclaim operation.
 2. For a binary install, the target compiler will never be installed. So
 when a user attempts to use the associated compiler wrappers, they will
 fail with "The Open MPI wrapper compiler was unable to find the specified
 compiler."

 This doesn't provide a good user experience. Instead, we should add a lib
 dependency on the target compiler, to avoid this situation.

 Of note, this is being done for Clang subports; it simply isn't for those
 using GCC as a target.

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Ticket URL: <https://trac.macports.org/ticket/62803>
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