bpo-39689: Do not use native packing for format "?" with standard size (GH-18969)

(cherry picked from commit 472fc84)

Co-authored-by: Stefan Krah <[email protected]>

Author: miss-islington

Modules/_struct.c

@@ -2339,6 +2339,9 @@ PyInit__struct(void)
                        "unknown" float format */
                     if (ptr->format == 'd' || ptr->format == 'f')
                         break;
+                    /* Skip _Bool, semantics are different for standard size */
+                    if (ptr->format == '?')
+                        break;
                     ptr->pack = native->pack;
                     ptr->unpack = native->unpack;
                     break;