Use _WIN32 instead WIN32. (#4484)

JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com

jerry-core/ecma/base/ecma-helpers-number.c

@@ -342,7 +342,7 @@ ecma_number_is_finite (ecma_number_t num) /**< ecma-number */
 {
 #if defined (__GNUC__) || defined (__clang__)
   return __builtin_isfinite (num);
-#elif defined (WIN32)
+#elif defined (_WIN32)
   return isfinite (num);
 #else
   return !ecma_number_is_nan (num) && !ecma_number_is_infinity (num);

jerry-core/ecma/builtin-objects/ecma-builtin-math.c

@@ -28,7 +28,7 @@
 #include "jrt.h"
 #include "jrt-libc-includes.h"
 
-#if defined (WIN32)
+#if defined (_WIN32)
 #include <intrin.h>
 #endif
 
@@ -553,7 +553,7 @@ ecma_builtin_math_dispatch_routine (uint8_t builtin_routine_id, /**< built-in wi
         uint32_t n = ecma_number_to_uint32 (x);
 #if defined (__GNUC__) || defined (__clang__)
         x = n ? __builtin_clz (n) : 32;
-#elif defined (WIN32)
+#elif defined (_WIN32)
         unsigned long ret;
         x = _BitScanReverse (&ret, n) ? 31 - ret : 32;
 #else