COMP: Fix cmcurl build on VMS

This defines IOCTL_3_ARGS in 'cmcurl/setup.h' to teach curl sources
about the three-argument ioctl() on VMS.

Utilities/cmcurl/setup.h

@@ -264,6 +264,10 @@ typedef unsigned char bool;
 
 #else /* MSDOS */
 
+#ifdef __VMS
+#define IOCTL_3_ARGS 1
+#endif
+
 #ifdef __BEOS__
 #define sclose(x) closesocket(x)
 #else /* __BEOS__ */