Issue 6503 - Fix builds on Windows

build.py

 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 import argparse
 import logging
 import os
 import re
 import shutil
 import subprocess
@@ skipping 21 matching lines @@
         parser.add_argument(*args, **kwargs)
 
     return partial(_make_argument, *args, **kwargs)
 
 
 def argparse_command(valid_platforms=None, multi_platform=False, arguments=()):
     def wrapper(func):
         def func_wrapper(*args, **kwargs):
             return func(*args, **kwargs)
 
-        short_desc, long_desc = func.__doc__.split(os.linesep + os.linesep, 1)
+        short_desc, long_desc = func.__doc__.split('\n\n', 1)
 
         ALL_COMMANDS.append({
             'name': func.__name__,
             'description': long_desc,
             'help_text': short_desc,
             'valid_platforms': valid_platforms or KNOWN_PLATFORMS,
             'multi_platform': multi_platform,
             'function': func,
             'arguments': arguments,
         })
@@ skipping 326 matching lines @@
     if build_available_subcommands(base_dir):
         MAIN_PARSER.set_defaults(base_dir=base_dir)
 
         # If no args are provided, this module is run directly from the command
         # line. argparse will take care of consuming sys.argv.
         arguments = MAIN_PARSER.parse_args(args if len(args) > 0 else None)
 
         function = arguments.function
         del arguments.function
         function(**vars(arguments))