The TinyGo net/http Transport was missing TLSHandshakeTimeout, so callers that
set it (e.g. skywire's skysocks HTTPS-over-mesh client) fail to compile. Add the
field; the TinyGo transport does the handshake inline so it is advisory, but it
lets standard net/http source build unchanged under TinyGo.
Moses Narrow
1638a87512