w32: Fix alignment problem with AESNI on Windows >= 8
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w32: Fix alignment problem with AESNI on Windows >= 8

* cipher/cipher-selftest.c (_gcry_cipher_selftest_alloc_ctx): New.
* cipher/rijndael.c (selftest_basic_128, selftest_basic_192)
(selftest_basic_256): Allocate context on the heap.

The stack alignment on Windows changed and because ld seems to limit
stack variables to a 8 byte alignment (we request 16), we get bus
errors from the selftests if AESNI is in use.

GnuPG-bug-id: T2085
Signed-off-by: Werner Koch <wk@gnupg.org>