wscript: drop unused local VERSION variables

pyflakes correctly points out problems like:
  gtk2_ardour/wscript:537:5 local variable 'VERSION' is assigned to but never used

gtk2_ardour/wscript

@@ -548,8 +548,6 @@ def build_color_scheme(path, prefix):
     return color_scheme
 
 def build(bld):
-
-    VERSION = "%s.%s" % (bld.env['MAJOR'], bld.env['MINOR'])
     I18N_PACKAGE = 'gtk2_ardour' + bld.env['MAJOR']
 
     # Tool to dump lua-bindings (of gtk2ardour + libs)

headless/wscript

@@ -19,9 +19,6 @@ def configure(conf):
     conf.load('misc')
 
 def build(bld):
-
-    VERSION = "%s.%s" % (bld.env['MAJOR'], bld.env['MINOR'])
-
     # just the normal executable version of the GTK GUI
     obj = bld (features = 'cxx c cxxprogram')
     # this program does not do the whole hidden symbols thing

libs/fst/wscript

@@ -21,8 +21,6 @@ def configure(conf):
         conf.check(compiler='cxx', lib='gdi32', mandatory=True, uselib_store='GDI32')
 
 def build(bld):
-    VERSION = "%s.%s" % (bld.env['MAJOR'], bld.env['MINOR'])
-
     if bld.is_defined('VST3_SUPPORT'):
         obj = bld (features = 'cxx c cxxprogram')
         obj.source    = 'vst3-scanner.cc'

luasession/wscript

@@ -20,7 +20,6 @@ def configure(conf):
             mandatory=False)
 
 def build(bld):
-    VERSION = "%s.%s" % (bld.env['MAJOR'], bld.env['MINOR'])
     if not bld.is_defined('HAVE_READLINE'):
         return
 

session_utils/wscript

@@ -67,7 +67,6 @@ def build_ardour_util(bld, util):
         obj.linkflags = ' -lintl'
 
 def build(bld):
-    VERSION = "%s.%s" % (bld.env['MAJOR'], bld.env['MINOR'])
     # session-utils depend on the dummy backend
     if not "dummy" in bld.env['BACKENDS']:
         return