pkg/system: remove deprecated EscapeArgs

It was deprecated in 63bada41e5, but won't
be carried to the new modules.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

pkg/system/args_windows.go

@@ -1,18 +0,0 @@
-package system
-
-import (
-	"strings"
-
-	"golang.org/x/sys/windows"
-)
-
-// EscapeArgs makes a Windows-style escaped command line from a set of arguments
-//
-// Deprecated: this function is no longer used and will be removed in the next release.
-func EscapeArgs(args []string) string {
-	escapedArgs := make([]string, len(args))
-	for i, a := range args {
-		escapedArgs[i] = windows.EscapeArg(a)
-	}
-	return strings.Join(escapedArgs, " ")
-}