Disable installing PYO and PYC. Fix install paths.

Installing PYO and PYC does not work so disable this. Move the
Python check to the top level and have a single place.

Fix the install paths a revert the 'from . import' changes. This
is resolved by installing into the correct paths.

tools/gdb/python/wscript

@@ -6,8 +6,7 @@ def options(opt):
     opt.load('python')
 
 def configure(conf):
-    conf.load('python')
-    conf.check_python_version((2,6,6))
+    pass
 
 def build(bld):
     source = ['__init__.py',
@@ -29,4 +28,5 @@ def build(bld):
               'watchdog.py']
     bld(features = 'py',
         source = source,
+        install_from = '.',
         install_path = '${PREFIX}/share/gdb/python/rtems')