The existing mips64vr-* multi-run build already handles mips5000
targets, so reuse that for mips64vr5* targets too.  This moves
more logic from build-time to runtime so we can have a single
binary that supports many targets.
                        sim_igen_filter="32,f"
                        sim_igen_machine="-M r3900"
                        ;;
-  mips64vr5*)          sim_gen=IGEN
-                       sim_igen_machine="-M vr5000"
-                       ;;
   mips64vr41*)         sim_gen=M16
                        sim_igen_machine="-M vr4100"
                        sim_m16_machine="-M vr4100"
                        sim_igen_filter="32,64,f"
                        sim_m16_filter="16"
                         ;;
-  mips64vr43* | mips64vr-* | mips64vrel-*)
+  mips64vr43* | mips64vr5* | mips64vr-* | mips64vrel-*)
                        sim_gen=MULTI
                        sim_multi_configs="\
                          vr4100:mipsIII,mips16,vr4100:32,64:mips4100,mips4111\
 
                        sim_igen_filter="32,f"
                        sim_igen_machine="-M r3900"
                        ;;
-  mips64vr5*)          sim_gen=IGEN
-                       sim_igen_machine="-M vr5000"
-                       ;;
   mips64vr41*)         sim_gen=M16
                        sim_igen_machine="-M vr4100"
                        sim_m16_machine="-M vr4100"
                        sim_igen_filter="32,64,f"
                        sim_m16_filter="16"
                         ;;
-  mips64vr43* | mips64vr-* | mips64vrel-*)
+  mips64vr43* | mips64vr5* | mips64vr-* | mips64vrel-*)
                        sim_gen=MULTI
                        sim_multi_configs="\
                          vr4100:mipsIII,mips16,vr4100:32,64:mips4100,mips4111\