Fix encoding error while creating executables on Windows

[nicoddemus]

As commented in #1632, the waf build still fails in the latest version.

I tried the PR locally on my machine and I can confirm that the recipe for waf now builds correctly.

For the record, here's a snipped of the bottom of the waf-script.py file which causes the problem:

wafdir = find_lib()
sys.path.insert(0, wafdir)

if __name__ == '__main__':

	from waflib import Scripting
	Scripting.waf_entry_point(cwd, VERSION, wafdir)

#==>
#BZh91AY&SYî?l��lv�þÿ°#.Ó�ÿÿÿÿÿÿÿÿÿÿÿ??Y@�Â?��%H4à?b�<g^è?#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.#.�ù�??�d\?mÏ??[*DU�ï?]??Ü2\??uö�º??#1µ?vÝå?{µuÛí??R{?#/?ìb?ïG�??íÕ??9M=p?#.4ò{?ÐkA�ìôz?m?nwzmïzô?µÓ]mô{Á??]îìç?ÝÛÞìåºÜzë?4�?ûîç{yöàú#.?<mî?îí;Ý??{íß�o?wÝ7=Û?µï?#.#.�Ð�?qtÐ�ÁÈû?#.FT?�?À�{ç�Ë?:

I don't know about waf (internals or otherwise), but I guess the scripts reads that binary data from itself during runtime for some purpose.

cc @tarcisiofischer @jakirkham @msarahan

Fix #1632

[msarahan]

Yikes, that makes a lot of sense now. I'm a little horrified by the need for this, but very grateful that you've figured it out. Waiting on AppVeyor, and will merge assuming success. Thanks!

[nicoddemus]

py27 passed on AppVeyor, while the other builds failed with:

__________________________ test_repo[perl-cpan-Moo-] __________________________
[gw0] win32 -- Python 3.4.5 C:\Miniconda3-x64\python.exe
Traceback (most recent call last):
  File "C:\projects\conda-build\conda_build\skeletons\cpan.py", line 162, in get_cpan_api_url
    output = dist_json_file.read()
  File "C:\Miniconda3-x64\lib\gzip.py", line 360, in read
    while self._read(readsize):
  File "C:\Miniconda3-x64\lib\gzip.py", line 433, in _read
    if not self._read_gzip_header():
  File "C:\Miniconda3-x64\lib\gzip.py", line 297, in _read_gzip_header
    raise OSError('Not a gzipped file')
OSError: Not a gzipped file
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "C:\projects\conda-build\tests\test_api_skeleton.py", line 21, in test_repo
    api.skeletonize(package, repo, version=version, output_dir=testing_workdir, config=test_config)
  File "C:\projects\conda-build\conda_build\api.py", line 201, in skeletonize
    recursive=recursive, config=config, **kwargs)
  File "C:\projects\conda-build\conda_build\skeletons\cpan.py", line 302, in skeletonize
    recursive=recursive, config=config)
  File "C:\projects\conda-build\conda_build\skeletons\cpan.py", line 481, in deps_for_package
    perl_version, config=config)
  File "C:\Miniconda3-x64\lib\site-packages\conda\utils.py", line 45, in __call__
    value = self.func(*args, **kw)
  File "C:\projects\conda-build\conda_build\skeletons\cpan.py", line 553, in dist_for_module
    rel_dict = get_cpan_api_url('{0}/v0/release/{1}'.format(cpan_url, module), colons=False)
  File "C:\projects\conda-build\conda_build\skeletons\cpan.py", line 167, in get_cpan_api_url
    rel_dict = json.loads(open(json_path).read())
  File "C:\Miniconda3-x64\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x8f in position 10876: character maps to <undefined>

That does not seem to be related to my change though. @msarahan is that test failure a fluke perhaps?

[nicoddemus]

Really seems like a fluke since #1686 also had the same errors on AppVeyor.

[msarahan]

Yeah, it's a fluke - or rather, something this PR didn't cause, but something I need to fix elsewhere. Thanks again for this PR. Merging.

[nicoddemus]

OK, thanks!

[github-actions]

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