Don't set GOMAXPROCS

This was a temporary fix for Go earlier than 1.5 to run code on all
avaialble cores. We don't need that any more since we require at least
Go 1.6.

src/cmds/restic/main.go

@@ -5,7 +5,6 @@ import (
 	"os"
 	"restic"
 	"restic/debug"
-	"runtime"
 
 	"github.com/spf13/cobra"
 
@@ -33,17 +32,6 @@ directories in an encrypted repository stored on different backends.
 	},
 }
 
-func init() {
-	// set GOMAXPROCS to number of CPUs
-	if runtime.Version() < "go1.5" {
-		gomaxprocs := os.Getenv("GOMAXPROCS")
-		debug.Log("read GOMAXPROCS from env variable, value: %s", gomaxprocs)
-		if gomaxprocs == "" {
-			runtime.GOMAXPROCS(runtime.NumCPU())
-		}
-	}
-}
-
 func main() {
 	debug.Log("main %#v", os.Args)
 	err := cmdRoot.Execute()