Remove convex_decomp in drivers/SCsub

follow-up f111d1aaede1b2036e63d5a44ecd0ecf057521c3

drivers/SCsub

@@ -33,11 +33,6 @@ else:
 # Core dependencies
 SConscript("png/SCsub")
 
-# Tools override
-# FIXME: Should likely be integrated in the tools/ codebase
-if env['tools']:
-    SConscript("convex_decomp/SCsub")
-
 if env['vsproj']:
     import os
     path = os.getcwd()