fix wscript to know about key binding dependencies

gtk2_ardour/wscript

@@ -719,11 +719,11 @@ def build(bld):
     # NATIVE ARDOUR BINDING FILES
     # explicitly state the use of perl here so that it works on windows too
     # 
-    a_rule = 'perl ../tools/fmt-bindings --platform="%s" --winkey="%s" --accelmap ${SRC} >${TGT}' % (sys.platform, bld.env['WINDOWS_KEY'] )
+    a_rule = 'perl ../tools/fmt-bindings --platform="%s" --winkey="%s" --accelmap ${SRC[0].abspath()} >${TGT}' % (sys.platform, bld.env['WINDOWS_KEY'] )
     for b in [ 'ardour' ] :
         obj = bld(
             target = b + '.keys',
-            source = b + '.keys.in',
+            source = [ b + '.keys.in', 'mixer.bindings', 'processor_box.bindings', 'step_editing.bindings', 'monitor.bindings' ],
             rule = a_rule
             )
         obj.install_path = bld.env['CONFDIR']