[tailscale] runtime/debug: embed Tailscale toolchain git rev #104
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This is another take on #49 (which we stopped using?), and less
intrusive, and also always on.
This puts puts the the Tailscale Go toolchain's git rev in
the binary, accessible as runtime/debug.TailscaleGitRev.
Caller code will have to access it guarded by the "tailscale_go" build
tag.
Updates #49