Also accept __ARM_NEON

The Clang used in the Android SDK, at least, defines both __ARM_NEON__
and __ARM_NEON for ARMv7, but only the latter for AArch64.

This change switches each use of __ARM_NEON__ to accept either.

Change-Id: I3b5d5badc9ff0210888fd456e9329dc53a2b9b09
Reviewed-on: https://boringssl-review.googlesource.com/c/33104
Commit-Queue: Adam Langley <alangley@gmail.com>
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

crypto/crypto.c

@@ -82,7 +82,8 @@ HIDDEN unsigned long OPENSSL_ppc64le_hwcap2 = 0;
 #if defined(OPENSSL_STATIC_ARMCAP)
 
 HIDDEN uint32_t OPENSSL_armcap_P =
-#if defined(OPENSSL_STATIC_ARMCAP_NEON) || defined(__ARM_NEON__)
+#if defined(OPENSSL_STATIC_ARMCAP_NEON) || \
+    (defined(__ARM_NEON__) || defined(__ARM_NEON))
     ARMV7_NEON |
 #endif
 #if defined(OPENSSL_STATIC_ARMCAP_AES) || defined(__ARM_FEATURE_CRYPTO)

include/openssl/cpu.h

@@ -125,7 +125,7 @@ OPENSSL_INLINE int CRYPTO_is_NEON_capable(void) {
   // hand-written NEON assembly. For now, continue to apply the workaround even
   // when the compiler is instructed to freely emit NEON code. See
   // https://crbug.com/341598 and https://crbug.com/606629.
-#if defined(__ARM_NEON__) && !defined(OPENSSL_ARM)
+#if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && !defined(OPENSSL_ARM)
   return 1;
 #else
   return CRYPTO_is_NEON_capable_at_runtime();
@@ -153,7 +153,8 @@ int CRYPTO_is_ARMv8_PMULL_capable(void);
 #else
 
 OPENSSL_INLINE int CRYPTO_is_NEON_capable(void) {
-#if defined(OPENSSL_STATIC_ARMCAP_NEON) || defined(__ARM_NEON__)
+#if defined(OPENSSL_STATIC_ARMCAP_NEON) || \
+    (defined(__ARM_NEON__) || defined(__ARM_NEON))
   return 1;
 #else
   return 0;