patch 8.2.3244: Lua 5.3 print() with a long string crashes

Problem:    Lua 5.3 print() with a long string crashes.
Solution:   Use a growarray instead of a Lua buffer. (Yegappan Lakshmanan,
            closes #8655)

src/misc2.c

@@ -1565,6 +1565,22 @@ ga_concat(garray_T *gap, char_u *s)
     }
 }
 
+/*
+ * Concatenate 'len' bytes from string 's' to a growarray.
+ * When "s" is NULL does not do anything.
+ */
+    void
+ga_concat_len(garray_T *gap, char_u *s, size_t len)
+{
+    if (s == NULL || *s == NUL)
+	return;
+    if (ga_grow(gap, len) == OK)
+    {
+	mch_memmove((char *)gap->ga_data + gap->ga_len, s, (size_t)len);
+	gap->ga_len += len;
+    }
+}
+
 /*
  * Append one byte to a growarray which contains bytes.
  */