runtime: remove checkgoarm function

Nothing in libgo calls checkgoarm, and it relies on a variable, goarm,
that is not set.

Change-Id: I90f06718f786643c3b96d5fb11436b3df991df7d
Reviewed-on: https://go-review.googlesource.com/c/140057
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
1 file changed