Crash when clib4.library is old and program uses pthreads

Binaries compiled against clib4 v2.2 that use pthreads, when attempting to run with clib4.library v2.1, prints to shell "This program requires clib4.library version 2.2" but then crashes in __pthread_exit_dtor() without returning to the shell.

You can test it with any of the test programs in test_programs/threads/

Start by running one of the programs under test_programs/threads/ with clib4.library v2.1 and v2.2, then trace the failure through __pthread_exit_dtor(). Confirm the version-mismatch path and pthread cleanup behavior; done means the program reports the incompatibility and returns to the shell without crashing.

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