Brad Fitzpatrick 541a4ed5b4 all: use buildfeatures consts in a few more places
Saves ~25 KB.

Updates #12614

Change-Id: I7b976e57819a0d2692824d779c8cc98033df0d30
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-06 10:48:55 -07:00
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