i18n-pt_BR: synchronized with
d14590f90cb6
reachableroots: rename "seen" array to "revstates" for future extension
It will be an array of bit flags, SEEN | ROOT | REACHABLE.
reachableroots: give anonymous name to short-lived "numheads" variable
I'll reuse it for the length of the roots list.
reachableroots: reduce nesting level by jumping to next iteration by continue
This can eliminate lines over 80 columns. No code change except for the
outermost "if" condition.