- Adjust objtool to handle a recent binutils change to not generate unused

 symbols anymore.

 - Revert the fail-the-build-on-fatal-errors objtool strategy for now due to the
 ever-increasing matrix of supported toolchains/plugins and them causing too
 many such fatal errors currently.

 - Do not add empty symbols to objdump's rbtree to accommodate clang removing
 section symbols.
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