setup: exclude crypt32.dll in py2exe builds

py2exe is picking up crypt32.dll as a dependency and is including
the DLL in the dist/lib directory, where it can get picked up by an
installer and distributed.

crypt32.dll is a core Windows DLL since Windows XP. We don't need
to distribute it.

Differential Revision: https://phab.mercurial-scm.org/D6136

setup.py

@@ -1253,7 +1253,7 b' py2exepackages = ['
 ]
 
 py2exeexcludes = []
-py2exedllexcludes = []
+py2exedllexcludes = ['crypt32.dll']
 
 if issetuptools:
     extra['python_requires'] = supportedpy