[PATCH 2 of 4] py3: ensure standard exceptions use `str` type strings in windows.py

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1538011518 14400
#      Wed Sep 26 21:25:18 2018 -0400
# Node ID e37a4df2bf1523b9f03ddbfe5db0209058e6c8f0
# Parent  88db05d80c8b8380861864e922ebea7567f372c2
py3: ensure standard exceptions use `str` type strings in windows.py

See also edaa40dc5fe5.

diff --git a/mercurial/windows.py b/mercurial/windows.py
--- a/mercurial/windows.py
+++ b/mercurial/windows.py
@@ -164,8 +164,8 @@ def posixfile(name, mode='r', buffering=
         return fp
     except WindowsError as err:
         # convert to a friendlier exception
-        raise IOError(err.errno, '%s: %s' % (
-            name, encoding.strtolocal(err.strerror)))
+        raise IOError(err.errno, r'%s: %s' % (
+            encoding.strfromlocal(name), err.strerror))
 
 # may be wrapped by win32mbcs extension
 listdir = osutil.listdir
@@ -201,7 +201,7 @@ class winstdout(object):
             if inst.errno != 0 and not win32.lasterrorwaspipeerror(inst):
                 raise
             self.close()
-            raise IOError(errno.EPIPE, 'Broken pipe')
+            raise IOError(errno.EPIPE, r'Broken pipe')
 
     def flush(self):
         try:
@@ -209,7 +209,7 @@ class winstdout(object):
         except IOError as inst:
             if not win32.lasterrorwaspipeerror(inst):
                 raise
-            raise IOError(errno.EPIPE, 'Broken pipe')
+            raise IOError(errno.EPIPE, r'Broken pipe')
 
 def _is_win_9x():
     '''return true if run on windows 95, 98 or me.'''
@@ -616,4 +616,4 @@ def readpipe(pipe):
     return ''.join(chunks)
 
 def bindunixsocket(sock, path):
-    raise NotImplementedError('unsupported platform')
+    raise NotImplementedError(r'unsupported platform')