[roll] Roll fuchsia [dl] Support RTLD_GLOBAL

This CL supports the RTLD_GLOBAL flag with dlopen(). The root
RuntimeModule and all its dependencies (either previously loaded or new
to the session) are marked as global when dlopen-ed with this flag.

This action may rearrange the "global load order" of modules: that is,
the order in which modules loaded with RTLD_GLOBAL are kept in the
dynamic linker's modules_ list.

This CL does not yet include global modules in symbol resolution, but
tests are introduced to test the following behavior in regards to how
global modules relate to load order:

- Promote previously loaded module and all its deps to become global.
- Promoting a previously loaded module to a global module can change the
  "global load order" of modules
- Calling dlopen(RTLD_GLOBAL) multiple times on a module will not change
  the "global load order".
- Calling dlopen(RTLD_GLOBAL) with previously loaded global modules will
  not change the "global load order".

A forthcoming CL will include global modules in symbol relocations and
tests will be enabled then.

Original-Bug: 338233824
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1124721
Original-Revision: ffaf6f0eed3d751c929575d337e1c4da5f8b313c
GitOrigin-RevId: 6611aec729e5487525a4f23e453be9f7f18024fe
Change-Id: I5a658f2bc29d202bc8bfe28bef217beec9a3c643