Add Error as part of the return values of os2.environ

core/os/os2/env.odin

@@ -41,7 +41,7 @@ clear_env :: proc() {
 // environ returns a copy of strings representing the environment, in the form "key=value"
 // NOTE: the slice of strings and the strings with be allocated using the supplied allocator
 @(require_results)
-environ :: proc(allocator: runtime.Allocator) -> []string {
+environ :: proc(allocator: runtime.Allocator) -> ([]string, Error) {
 	return _environ(allocator)
 }