Update Waf to 1.5.2 and update build scripts accordingly

katze/wscript_build

@@ -7,7 +7,7 @@ import platform
 obj = bld.new_task_gen ('cc', 'staticlib')
 obj.name = 'katze'
 obj.target = 'katze'
-obj.includes = '.'
+obj.includes = '. ../.'
 obj.find_sources_in_dirs ('.')
 obj.uselib = 'GMODULE LIBSOUP GTK LIBXML'
 obj.install_path = None

midori/wscript_build

@@ -3,8 +3,6 @@
 # This file is licensed under the terms of the expat license, see the file EXPAT.
 
 obj = bld.new_task_gen ('cc', 'program')
-# After waf 1.4.4 this additional link flag is needed for extensions
-obj.env.append_value ('LINKFLAGS', '-Wl,--export-dynamic')
 obj.target = 'midori'
 obj.includes = '. .. ../panels'
 obj.find_sources_in_dirs ('. ../panels')