queue errors due to strictures rather than printing them as

queue errors due to strictures rather than printing them as
warnings; symbols that violate strictures do *not* end up in
the symbol table anyway, making multiple evals of the same piece
of code produce the same errors; errors indicate all locations
of a global symbol rather than just the first one; these
changes make compile-time failures within evals reliably
visible via the return value or contents of $@, and trappable
using __DIE__ hooks

p4raw-id: //depot/perl@4197