Fix builds on Armv8 systems without AArch64
This fixes "undefined reference to `aes_gcm_dec_128_kernel' in function
`armv8_aes_gcm_decrypt'" and similar
Fixes
@@ -100,7 +100,7 @@ void AES_xts_decrypt(const unsigned char *inp, unsigned char *out, size_t len,
# define AES_PMULL_CAPABLE ((OPENSSL_armcap_P & ARMV8_PMULL) && (OPENSSL_armcap_P & ARMV8_AES))
# define AES_GCM_ENC_BYTES 512
# define AES_GCM_DEC_BYTES 512
-# if __ARM_MAX_ARCH__>=8
+# if __ARM_MAX_ARCH__>=8 && defined(__aarch64__)
# define AES_gcm_encrypt armv8_aes_gcm_encrypt
# define AES_gcm_decrypt armv8_aes_gcm_decrypt
# define AES_GCM_ASM(gctx) ((gctx)->ctr==aes_v8_ctr32_encrypt_blocks && \
