bufhelp: use one-byte aligned type for unaligned memory accesses
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bufhelp: use one-byte aligned type for unaligned memory accesses

* cipher/bufhelp.h (BUFHELP_FAST_UNALIGNED_ACCESS): Enable only when
HAVE_GCC_ATTRIBUTE_PACKED and HAVE_GCC_ATTRIBUTE_ALIGNED are defined.
(bufhelp_int_t): New type.
(buf_cpy, buf_xor, buf_xor_1, buf_xor_2dst, buf_xor_n_copy_2): Use
'bufhelp_int_t'.
[BUFHELP_FAST_UNALIGNED_ACCESS] (bufhelp_u32_t, bufhelp_u64_t): New.
[BUFHELP_FAST_UNALIGNED_ACCESS] (buf_get_be32, buf_get_le32)
(buf_put_be32, buf_put_le32, buf_get_be64, buf_get_le64)
(buf_put_be64, buf_put_le64): Use 'bufhelp_uXX_t'.
* configure.ac (gcry_cv_gcc_attribute_packed): New.