wscript: stop loading misc where nothing is using it

It is apparently only used in gtk2_ardour/wscript - and it seems to be
enough to load it in configure(), even though it is used in build().

gtk2_ardour/wscript

@@ -434,7 +434,7 @@ def options(opt):
     pass
 
 def configure(conf):
-    conf.load('misc')
+    conf.load('misc')  # make 'command-output' available
 
     # TODO: Insert a sanity check for on OS X to ensure CoreAudio is present
 

headless/wscript

@@ -11,7 +11,7 @@ def options(opt):
     pass
 
 def configure(conf):
-    conf.load('misc')
+    pass
 
 def build(bld):
     # just the normal executable version of the GTK GUI

libs/fst/wscript

@@ -10,8 +10,6 @@ def options(opt):
     pass
 
 def configure(conf):
-    conf.load('misc')
-
     if conf.env['WINDOWS_VST_SUPPORT'] == True:
         conf.check(compiler='cxx', lib='gdi32', mandatory=True, uselib_store='GDI32')
 

luasession/wscript

@@ -7,7 +7,6 @@ def options(opt):
     pass
 
 def configure(conf):
-    conf.load('misc')
     conf.check_cc(
             header_name='stdio.h readline/readline.h',
             lib='readline',

session_utils/wscript

@@ -14,7 +14,6 @@ def configure(conf):
         return
 
     autowaf.display_msg(conf, 'build session-utils', 'yes')
-    conf.load('misc')
 
 def build_ardour_util(bld, util):
     pgmprefix = bld.env['PROGRAM_NAME'].lower() + str(bld.env['MAJOR'])