As discussed in CL 346150, conditional bitcode build flag was introduced
in CL 214899, for Go >= 1.14 but not Go 1.13.
Since we have dropped the support for 1.13, all bitcode conditions
can be removed.
Hence this CL removes it.
Updates golang/go#47952
Change-Id: I0436cad8d5ab5675b647e25e7dfa85af85996a7e
Reviewed-on: https://go-review.googlesource.com/c/mobile/+/346390
Reviewed-by: Hajime Hoshi <hajimehoshi@gmail.com>
Run-TryBot: Hajime Hoshi <hajimehoshi@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
ddd6497b06