Add support to import custom variables from parent SConstruct (redux)

Author: adamscott

SConstruct

@@ -85,6 +85,10 @@ if env.GetOption("num_jobs") == altered_num_jobs:
 
 # Custom options and profile flags.
 customs = ["custom.py"]
+try:
+ customs += Import("customs")
+except:
+ pass
 profile = ARGUMENTS.get("profile", "")
 if profile:
  if os.path.isfile(profile):