Add missing Extern "C" to MSVC portmacro.h

Author: CrustyAuklet

portable/MSVC-MingW/portmacro.h

@@ -40,6 +40,10 @@
 #include <mmsystem.h>
 #include <winbase.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /******************************************************************************
 *   Defines
 ******************************************************************************/
@@ -215,4 +219,8 @@ void vPortGenerateSimulatedInterruptFromWindowsThread( uint32_t ulInterruptNumbe
 void vPortSetInterruptHandler( uint32_t ulInterruptNumber,
                                uint32_t ( * pvHandler )( void ) );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* ifndef PORTMACRO_H */