[DynInst_API:] [dyninst/dyninst] 5165d8: Remove unused build options (#1253)

[Tim Haines <noreply@xxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: 5165d8ce5eda38f94eb7c4f12497ef4aefad3f4b
      https://github.com/dyninst/dyninst/commit/5165d8ce5eda38f94eb7c4f12497ef4aefad3f4b
  Author: Tim Haines <thaines.astro@xxxxxxxxx>
  Date:   2022-04-12 (Tue, 12 Apr 2022)

  Changed paths:
    M CMakeLists.txt
    M cmake/options.cmake

  Log Message:
  -----------
  Remove unused build options (#1253)

* Remove BUILD_DOCS

This isn't sufficient to create the documentation as some of it is
contained in MS Word files.

* Remove BUILD_TARBALLS

We don't distrubute tarballs anymore. That's handled by GitHub.