Workaround for MSVC

Author: jmroot

Include/pymacro.h

@@ -12,8 +12,10 @@
 // static_assert is defined in glibc from version 2.16. Compiler support for
 // the C11 _Static_assert keyword is in gcc >= 4.6.
 
+// MSVC makes static_assert a keyword, contrary to the C standard.
+
 // In C++ 11 static_assert is a keyword, redefining is undefined behaviour.
-#if !defined(static_assert) \
+#if !defined(static_assert) && !defined(_MSC_VER) \
      && !(defined(__cplusplus) && __cplusplus >= 201103L)
 #  define static_assert _Static_assert
 #endif