Bug #26 followup: Generated Go file missing 'import "math"'

Error:

sim_gen/bridge.go:75:27: undefined: math

Generated code uses math.Pi, math.Sin, math.Cos but the file is missing:

import "math"

Header of sim_gen/bridge.go shows no imports:

// Code generated by ailang. DO NOT EDIT.
package sim_gen

func screenWidth_impl(...

Codegen needs to add the math import when std/math functions are used.

Reported by: cli via ailang messages