Remove unnecessary definitions

The production buildings for those units are not buildable

mods/ra/maps/exodus/rules.yaml

@@ -39,10 +39,6 @@ E7:
 	Buildable:
 		Prerequisites: ~disabled
 
-TRAN:
-	Buildable:
-		Prerequisites: ~disabled
-
 BARR:
 	Buildable:
 		Prerequisites: ~disabled
@@ -51,18 +47,6 @@ MIG:
 	Buildable:
 		Prerequisites: ~disabled
 
-HELI:
-	Buildable:
-		Prerequisites: ~disabled
-
-MH60:
-	Buildable:
-		Prerequisites: ~disabled
-
-SS:
-	Buildable:
-		Prerequisites: ~disabled
-
 ARTY:
 	Buildable:
 		Prerequisites: ~disabled
@@ -71,22 +55,6 @@ AGUN:
 	Buildable:
 		Prerequisites: ~disabled
 
-MSUB:
-	Buildable:
-		Prerequisites: ~disabled
-
-DD:
-	Buildable:
-		Prerequisites: ~disabled
-
-CA:
-	Buildable:
-		Prerequisites: ~disabled
-
-PT:
-	Buildable:
-		Prerequisites: ~disabled
-
 MSLO:
 	Buildable:
 		Prerequisites: ~disabled