include/winnt.h: Fix a typo in _MSC_VER.

[Dmitry Timoshkov]

---
 include/winnt.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/winnt.h b/include/winnt.h
index f785d33..93fd70a 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -154,7 +154,7 @@ extern "C" {
 # define DECLSPEC_EXPORT
 #endif
 
-#if defined(__MSC_VER) || defined(__MINGW32__) || defined(__CYGWIN__)
+#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__CYGWIN__)
 # define DECLSPEC_HIDDEN
 #elif defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
 # define DECLSPEC_HIDDEN __attribute__((visibility ("hidden")))
-- 
1.9.1