libgcrypt: Import libgcrypt 1.11

We currently use an old version of libgcrypt which results in us having
fewer ciphers and missing on many other improvements.

Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/lib/libgcrypt/mpi/amd64/mpi-asm-defs.h

@@ -1,4 +1,4 @@
 /* This file defines some basic constants for the MPI machinery.  We
  * need to define the types on a per-CPU basis, so it is done with
  * this file here.  */
-#define BYTES_PER_MPI_LIMB  8
+#define BYTES_PER_MPI_LIMB  (SIZEOF_UNSIGNED_LONG_LONG)