[213] Makefile simplification

Branch-unrelated change.

The noinst_ prefix does this, no need to go through explicitly defining
bunch of variables.

src/lib/python/Makefile.am

@@ -1,15 +1,8 @@
 SUBDIRS = isc
 
-python_PYTHON =	bind10_config.py
+nodist_python_PYTHON =	bind10_config.py
 pythondir = $(pyexecdir)
 
-# Explicitly define DIST_COMMON so ${python_PYTHON} is not included
-# as we don't want the generated file included in distributed tarfile.
-DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in bind10_config.py.in
-
-# When setting DIST_COMMON, then need to add the .in file too.
-EXTRA_DIST =  bind10_config.py.in
-
 CLEANFILES = bind10_config.pyc
 CLEANDIRS = __pycache__