Fix duk_tval_decref_norz() missing norz
Fix duk_tval_decref_norz() missing norz

This is unused code unless fast refcounts are disabled (they are enabled by
default even on low memory targets now).

markand/duktape,svaarala/duktape,markand/duktape,svaarala/duktape,markand/duktape,markand/duktape,svaarala/duktape,markand/duktape,svaarala/duktape,svaarala/duktape,svaarala/duktape,markand/duktape,markand/duktape,markand/duktape,svaarala/duktape,svaarala/duktape,markand/duktape,markand/duktape,svaarala/duktape