Add strict mode API

See https://github.com/libbpf/libbpf/wiki/Libbpf-1.0-migration-guide for context.
Related to #159

libbpfgo.go

@@ -328,6 +328,24 @@ func NewModuleFromFile(bpfObjPath string) (*Module, error) {
 	})
 }
 
+func SetStrictMode(mode string) error {
+	var chosenMode uint32
+	switch mode {
+	case "all":
+		chosenMode = C.LIBBPF_STRICT_ALL
+	case "none":
+		chosenMode = C.LIBBPF_STRICT_NONE
+	case "clean_ptrs":
+		chosenMode = C.LIBBPF_STRICT_CLEAN_PTRS
+	case "direct_errs":
+		chosenMode = C.LIBBPF_STRICT_DIRECT_ERRS
+	default:
+		return fmt.Errorf("%s is not a valid strict mode", mode)
+	}
+	C.libbpf_set_strict_mode(chosenMode)
+	return nil
+}
+
 func NewModuleFromFileArgs(args NewModuleArgs) (*Module, error) {
 	C.set_print_fn()
 	if err := bumpMemlockRlimit(); err != nil {
@@ -787,7 +805,6 @@ func (b *BPFMap) DeleteKeyBatch(keys unsafe.Pointer, count uint32) error {
 		ElemFlags: C.BPF_ANY,
 		Flags:     C.BPF_ANY,
 	}
-
 	errC := C.bpf_map_delete_batch(b.fd, keys, &countC, bpfMapBatchOptsToC(opts))
 	if errC != 0 {
 		sc := syscall.Errno(-errC)