Fix typo in header.
@@ -324,7 +324,7 @@ typedef struct {
#include <winsock2.h>
#endif
#include <windows.h>
-typedef CRTICAL_SECTION JanetOSMutex;
+typedef CRITICAL_SECTION JanetOSMutex;
#else
#include <pthread.h>
typedef pthread_mutex_t JanetOSMutex;
