Change WIN32 to _WIN32. (#260)
WIN32 is defined by the SDK, but _WIN32 is defined by the compiler.
Since Dawn doesn't necessarily include <windows.h> everywhere dawn.h is
included, we should use _WIN32 (which will always be defined).
diff --git a/src/include/dawn/dawn_export.h b/src/include/dawn/dawn_export.h
index 4c6db97..d00c8fd 100644
--- a/src/include/dawn/dawn_export.h
+++ b/src/include/dawn/dawn_export.h
@@ -15,7 +15,7 @@
#ifndef DAWN_EXPORT_H_
#define DAWN_EXPORT_H_
-#if defined(WIN32)
+#if defined(_WIN32)
# if defined(DAWN_IMPLEMENTATION)
# define DAWN_EXPORT __declspec(dllexport)
# else
diff --git a/src/include/dawn_native/dawn_native_export.h b/src/include/dawn_native/dawn_native_export.h
index f28ff85..f258167 100644
--- a/src/include/dawn_native/dawn_native_export.h
+++ b/src/include/dawn_native/dawn_native_export.h
@@ -15,7 +15,7 @@
#ifndef DAWNNATIVE_EXPORT_H_
#define DAWNNATIVE_EXPORT_H_
-#if defined(WIN32)
+#if defined(_WIN32)
# if defined(DAWN_NATIVE_IMPLEMENTATION)
# define DAWN_NATIVE_EXPORT __declspec(dllexport)
# else
diff --git a/src/include/dawn_wire/dawn_wire_export.h b/src/include/dawn_wire/dawn_wire_export.h
index 327c58e..d223762 100644
--- a/src/include/dawn_wire/dawn_wire_export.h
+++ b/src/include/dawn_wire/dawn_wire_export.h
@@ -15,7 +15,7 @@
#ifndef DAWNWIRE_EXPORT_H_
#define DAWNWIRE_EXPORT_H_
-#if defined(WIN32)
+#if defined(_WIN32)
# if defined(DAWN_WIRE_IMPLEMENTATION)
# define DAWN_WIRE_EXPORT __declspec(dllexport)
# else
