Rebuild extension modules when we change headers

I think we track the dependency correctly in cmake, but distutils
doesn't know that the system headers can change from underneath it,
so manually specify them as extra dependencies.

from_cpython/setup.py

 # CPython has a 2kloc version of this file
 
 from distutils.core import setup, Extension
+import glob
 import os
 import sysconfig
 
@@ -132,5 +133,10 @@ ext_modules = [future_builtins_ext(),
                curses_ext(),
                termios_ext()]
 
+builtin_headers = map(relpath, glob.glob("Include/*.h"))
+
+for m in ext_modules:
+    m.depends += builtin_headers
+
 
 setup(name="Pyston", version="1.0", description="Pyston shared modules", ext_modules=ext_modules)

test/test_extension/setup.py

 from distutils.core import setup, Extension
+import glob
+import os
+
+extensions = [
+    Extension("basic_test", sources = ["basic_test.c"]),
+    Extension("descr_test", sources = ["descr_test.c"]),
+    Extension("slots_test", sources = ["slots_test.c"]),
+]
+
+def relpath(fn):
+    r =  os.path.join(os.path.dirname(__file__), fn)
+    return r
+
+print glob.glob("../from_cpython/Include/*.h")
+builtin_headers = map(relpath, glob.glob("../../from_cpython/Include/*.h"))
+
+for m in extensions:
+    m.depends += builtin_headers
+
 
 setup(name="test",
         version="1.0",
         description="test",
-        ext_modules=[
-            Extension("basic_test", sources = ["basic_test.c"]),
-            Extension("descr_test", sources = ["descr_test.c"]),
-            Extension("slots_test", sources = ["slots_test.c"]),
-        ],
+        ext_modules=extensions,
     )