Log Message:
net/bind916 Use atomic 32-bit integers where appropriate, revision++

Mostly taken from NetBSD base:

- For counters, make sure to use 32-bit integers for !_LP64 platforms.
  In the previous revisions, this is partially done, i.e., incomplete.

- For flags fit within 32-bit width, use 32-bit integers for everyone.
  In the previous, this is incomplete, and restricted for __NetBSD__.
  Fix and generalize to everyone.

- Make comments in patches more helpful.

Fix build for ILP32 platforms as reported in PR pkg/56315.

Thanks jklos@ for testing.