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Issue: TXR holds numerous symbol references in global
variables, like list_s. These variables are not registered as
root pointers with the garbage collector. This is normally
okay because symbols are reachable via packages. However,
if such a symbol is uninterned, that causes an integrity problem.
Solution: protect those symbols from being removed from their
packages.
* Makefile (OBJS): Add protsym.o.
* genprotsym.txr, protsym.c: New files.
* lib.c (prot_sym_check): New static function.
(use_sym, uintern, rehome_sym): Use prot_sym_check to
implement a defense against internal symbols being booted
out of their package.
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