improve platform relative check

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/aes.c b/library/aes.c
index 8afa7a6..4929235 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -34,27 +34,23 @@
 #include "mbedtls/platform_util.h"
 #include "mbedtls/error.h"
 
-#if defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__) && \
+#if defined(MBEDTLS_HAVE_ASM) && \
     defined(__aarch64__) && !defined(MBEDTLS_HAVE_ARM64)
-#define MBEDTLS_HAVE_ARM64
 #if !defined(MBEDTLS_AESCE_C) && defined(MBEDTLS_AES_USE_HARDWARE_ONLY)
 #error "MBEDTLS_AES_USE_HARDWARE_ONLY defined, but not all prerequisites"
 #endif
 #endif
 
-#if defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__) && \
+#if defined(MBEDTLS_HAVE_ASM) && \
     (defined(__amd64__) || defined(__x86_64__))   &&  \
     !defined(MBEDTLS_HAVE_X86_64)
-#define MBEDTLS_HAVE_X86_64
 #if !defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_AES_USE_HARDWARE_ONLY)
 #error "MBEDTLS_AES_USE_HARDWARE_ONLY defined, but not all prerequisites"
 #endif
 #endif
 
-#if defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__) && defined(__i386__) && \
+#if defined(MBEDTLS_HAVE_ASM) && defined(__i386__) && \
     !defined(MBEDTLS_HAVE_ASAN)
-#define MBEDTLS_HAVE_X86
-
 #if !defined(MBEDTLS_PADLOCK_C) && defined(MBEDTLS_AES_USE_HARDWARE_ONLY)
 #error "MBEDTLS_AES_USE_HARDWARE_ONLY defined, but not all prerequisites"
 #endif