SCP: Add SIM_BIN_PATH environment variable as the simulator's argv[0]

scp.c

@@ -2209,6 +2209,7 @@ if (*argv[0]) {                                         /* sim name arg? */
         np = strrchr (nbuf, ']');                       /* VMS path separator */
     if (np != NULL)
         setenv ("SIM_BIN_NAME", np+1, 1);               /* Publish simulator binary name */
+    setenv ("SIM_BIN_PATH", argv[0], 1);
     }
 sim_argv = argv;
 cptr = getenv("HOME");