Remove redundant entrypoint text normalization

src/pip/_internal/operations/install/wheel.py

@@ -121,16 +121,8 @@ def get_entrypoints(filename):
     if not os.path.exists(filename):
         return {}, {}
 
-    # This is done because you can pass a string to entry_points wrappers which
-    # means that they may or may not be valid INI files. The attempt here is to
-    # strip leading and trailing whitespace in order to make them valid INI
-    # files.
     with io.open(filename, encoding="utf-8") as fp:
-        data = io.StringIO()
-        for line in fp:
-            data.write(line.strip())
-            data.write(u"\n")
-        data.seek(0)
+        data = fp.read()
 
     # get the entry points and then the script names
     entry_points = pkg_resources.EntryPoint.parse_map(data)