copy complexobject.cpp from CPython and enable cmath module

from_cpython/CMakeLists.txt

@@ -36,6 +36,7 @@ file(GLOB_RECURSE STDMODULE_SRCS Modules
     bufferedio.c
     bytesio.c
     cache.c
+    cmathmodule.c
     connection.c
     cStringIO.c
     cursor.c
@@ -83,6 +84,7 @@ file(GLOB_RECURSE STDOBJECT_SRCS Objects
     bytes_methods.c
     capsule.c
     cobject.c
+    complexobject.c
     dictproxy.c
     exceptions.c
     floatobject.c

from_cpython/setup.py

@@ -39,6 +39,13 @@ def bz2_ext():
             "Modules/bz2module.c",
             ]), libraries = ['bz2'])
 
+@unique
+def cmath_ext():
+    return Extension("cmath", sources = map(relpath, [
+            "Modules/cmathmodule.c",
+            ]))
+
+
 @unique
 def ctypes_ext():
     ext = Extension("_ctypes", sources = map(relpath, [
@@ -144,6 +151,7 @@ ext_modules = [future_builtins_ext(),
                pyexpat_ext(),
                elementtree_ext(),
                bz2_ext(),
+               cmath_ext(),
                ctypes_ext(),
                ctypes_test_ext(),
                grp_ext(),