Don't align NEWPOLY_POLY.

The alignas in NEWPOLY_POLY told the compiler that it could assume a
certain alignment. However, values were allocated with malloc with no
specific alignment.

We could try and allocate aligned memory but the alignment doesn't have
a performance impact (on x86-64) so this is the simpler change. (Also,
Windows doesn't have |posix_memalign|. The cloest thing is
_alligned_alloc but then one has to use a special free function.)

Change-Id: I53955a88862160c02aa5436d991b1b797c3c17db
Reviewed-on: https://boringssl-review.googlesource.com/8315
Reviewed-by: David Benjamin <davidben@google.com>

crypto/newhope/internal.h

diff --git a/crypto/newhope/internal.h b/crypto/newhope/internal.h
index efc5adf..eb170c0 100644
--- a/crypto/newhope/internal.h
+++ b/crypto/newhope/internal.h
@@ -32,7 +32,7 @@
 
 /* Polynomial coefficients in unpacked form. */
 struct newhope_poly_st {
-  alignas(32) uint16_t coeffs[PARAM_N];
+  uint16_t coeffs[PARAM_N];
 };
 
 /* SEED_LENGTH is the length of the AES-CTR seed used to derive a polynomial. */