Technically not the same as the wasm cross-compilation, but it's
closely connected to it.
Also includes some fixes to tool/yasm to make it actually work on
non-ARM platforms.
Fixes#5134
Signed-off-by: Mihai Parparita <mihai@tailscale.com>
We now have the actual module that we need to build, so switch to
building it directly instead of its (expected) dependencies.
Also fix a copy/paste error in a jsdeps comment.
Signed-off-by: Mihai Parparita <mihai@tailscale.com>
For now just checks that we can build cmd/tailscale/cli, will be
broadened once we can actually build more things.
Updates #3157
Signed-off-by: Mihai Parparita <mihai@tailscale.com>
