Fwd: [PATCH] tdestroy() should allow passing 'NULL' for 'freefct' callback

[Roland McGrath]

This is a user-visible change, so needs a BZ.  Probably this should use a
new symbol version.  The compat routine need not behave any differently.
But when someone builds a new program that might rely on the new behavior,
they should get a symbol version dependency that ensures that attempting to
run that program against an older library will give a coherent
binary-compatibility error rather than just crashing in tdestroy.