wscript: drop unused "mandatory variables" 'top' and 'out' in libs

New files missed in d220f477ed.

libs/ctrl-interface/midi_surface/wscript

@@ -1,10 +1,6 @@
 #!/usr/bin/env python
 from waflib.extras import autowaf as autowaf
 
-# Mandatory variables
-top = '.'
-out = 'build'
-
 def options(opt):
     autowaf.set_options(opt)
 

libs/ctrl-interface/wscript

@@ -1,10 +1,6 @@
 #!/usr/bin/env python
 from waflib.extras import autowaf as autowaf
 
-# Mandatory variables
-top = '.'
-out = 'build'
-
 children = [
     'control_protocol',
     'midi_surface'

libs/surfaces/console1/wscript

@@ -2,10 +2,6 @@
 from waflib.extras import autowaf as autowaf
 import os
 
-# Mandatory variables
-top = '.'
-out = 'build'
-
 def options(opt):
     autowaf.set_options(opt)
 

libs/surfaces/launchpad_pro/wscript

@@ -2,10 +2,6 @@
 from waflib.extras import autowaf as autowaf
 import os
 
-# Mandatory variables
-top = '.'
-out = 'build'
-
 def options(opt):
     autowaf.set_options(opt)