bpo-31904: Add cross-build support for VxWorks RTOS (GH-11968)

diff --git a/Include/osdefs.h b/Include/osdefs.h
index bd84c1c..3243944 100644
--- a/Include/osdefs.h
+++ b/Include/osdefs.h
@@ -14,6 +14,10 @@
 #define DELIM L';'
 #endif
 
+#ifdef __VXWORKS__
+#define DELIM L';'
+#endif
+
 /* Filename separator */
 #ifndef SEP
 #define SEP L'/'