Fix Win32 build error (#843)

Fix compilation error on Win32 platform.

core/iwasm/aot/aot_runtime.h

@@ -197,8 +197,7 @@ typedef struct AOTModule {
     uint8 *literal;
     uint32 literal_size;
 
-#if (defined(BUILD_TARGET_X86_64) || defined(BUILD_TARGET_AMD_64)) \
-    && defined(BH_PLATFORM_WINDOWS)
+#if defined(BH_PLATFORM_WINDOWS)
     /* extra plt data area for __xmm and __real constants
        in Windows platform, NULL for JIT mode */
     uint8 *extra_plt_data;