libpthread: Fix expected symbols on alpha and hppa.

These have PTHREAD__ASM_RASOPS and define a different subset of
symbols which get exported. None of these pthread__ras_* and
pthread__lock_* symb

libpthread: Fix expected symbols on alpha and hppa.

These have PTHREAD__ASM_RASOPS and define a different subset of
symbols which get exported. None of these pthread__ras_* and
pthread__lock_* symbols _should_ be exported but we can fix that in a
future revbump.

PR lib/58838: shared libraries in base should all have expsym lists

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