Fix test on Windows.

tests/build/depfile_package.srctree

@@ -8,13 +8,13 @@ PYTHON package_test.py
 import os.path
 
 with open("pkg/test.c.dep", "r") as f:
-    contents = f.read().replace("\\\n", " ").replace("\\\n", " ")
+    contents = f.read().replace("\\\n", " ").replace("\n", " ")
 
 assert sorted(contents.split()) == sorted(['test.c:', os.path.join('sub', 'incl.pxi'), 'test.pxd', 'test.pyx']), contents
 
 
 with open("pkg/sub/test.c.dep", "r") as f:
-    contents = f.read().replace("\n", " ").replace("\\", "")
+    contents = f.read().replace("\\\n", " ").replace("\n", " ")
 
 contents = [os.path.relpath(entry, '.')
             if os.path.isabs(entry) else entry for entry in contents.split()]