Brad Fitzpatrick f42be719de all: use buildfeature constants in a few more places
Saves 21 KB.

Updates #12614

Change-Id: I0cd3e735937b0f5c0fcc9f09a24476b1c4ac9a15
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-03 10:08:06 -07:00
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