[Hamlib-developer] RFC #807--Change rig ptr checks to function to check valid rig ptr in list

[Nate B. <n0...@n0...>]

https://github.com/Hamlib/Hamlib/issues/807

Requires adding a linked list and inserting the rig ptr during open and
removing it during close.

Replaces #785[1]

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73, Nate

[1] https://github.com/Hamlib/Hamlib/issues/785
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