Don't attempt to pack structures with pointers - should fix aarch64 issues

* These structures shouldn't be accessed by offsets anywhere in code anyway

Author: bryan-hunt

lib/atcacert/atcacert_def.h

@@ -172,7 +172,7 @@ typedef struct ATCA_PACKED atcacert_cert_element_s
  * If any of the standard certificate elements (std_cert_elements) are not a part of the certificate
  * definition, set their count to 0 to indicate their absence.
  */
-typedef struct ATCA_PACKED atcacert_def_s
+typedef struct atcacert_def_s
 {
     atcacert_cert_type_t           type;                                    //!< Certificate type.
     uint8_t                        template_id;                             //!< ID for the this certificate definition (4-bit value).
@@ -198,7 +198,7 @@ typedef struct ATCA_PACKED atcacert_def_s
  * Tracks the state of a certificate as it's being rebuilt from device information.
  */
 
-typedef struct ATCA_PACKED atcacert_build_state_s
+typedef struct atcacert_build_state_s
 {
     const atcacert_def_t* cert_def;             //!< Certificate definition for the certificate being rebuilt.
     uint8_t*              cert;                 //!< Buffer to contain the rebuilt certificate.

python/cryptoauthlib/atcacert.py

@@ -221,8 +221,6 @@ class atcacert_def_t(AtcaStructure):
     """
     CTypes mirror of atcacert_def_t from atcacert_def.h
     """
-    _pack_ = 1
-
     def __init__(self, *args, **kwargs):
         if kwargs is not None:
             _atcacert_convert_enum(kwargs, 'type', atcacert_cert_type_t)