Some more static -> protected.

Rev: src/builtin.cmod:1.216
Rev: src/builtin_functions.c:1.677
Rev: src/iterators.cmod:1.69
Rev: src/language.yacc:1.438
Rev: src/mklibpike.pike:1.5
Rev: src/operators.c:1.235
Rev: src/threads.c:1.258