smcposix: pass unicode as first argument to array.array

This is an instance where we can safely convert the first argument, rest are
the cases except one where we are using 'c' which is not there in Python 3. So
that needs to be handled differently. This will help in making `hg help` run on
Python 3.

mercurial/scmposix.py

@@ -1,79 +1,79 b''
 from __future__ import absolute_import
 
 import array
 import errno
 import fcntl
 import os
 import sys
 
 from . import (
     encoding,
     osutil,
     pycompat,
 )
 
 def _rcfiles(path):
     rcs = [os.path.join(path, 'hgrc')]
     rcdir = os.path.join(path, 'hgrc.d')
     try:
         rcs.extend([os.path.join(rcdir, f)
                     for f, kind in osutil.listdir(rcdir)
                     if f.endswith(".rc")])
     except OSError:
         pass
     return rcs
 
 def systemrcpath():
     path = []
     if pycompat.sysplatform == 'plan9':
         root = 'lib/mercurial'
     else:
         root = 'etc/mercurial'
     # old mod_python does not set sys.argv
     if len(getattr(sys, 'argv', [])) > 0:
         p = os.path.dirname(os.path.dirname(pycompat.sysargv[0]))
         if p != '/':
             path.extend(_rcfiles(os.path.join(p, root)))
     path.extend(_rcfiles('/' + root))
     return path
 
 def userrcpath():
     if pycompat.sysplatform == 'plan9':
         return [encoding.environ['home'] + '/lib/hgrc']
     elif pycompat.sysplatform == 'darwin':
         return [os.path.expanduser('~/.hgrc')]
     else:
         confighome = encoding.environ.get('XDG_CONFIG_HOME')
         if confighome is None or not os.path.isabs(confighome):
             confighome = os.path.expanduser('~/.config')
 
         return [os.path.expanduser('~/.hgrc'),
                 os.path.join(confighome, 'hg', 'hgrc')]
 
 def termsize(ui):
     try:
         import termios
         TIOCGWINSZ = termios.TIOCGWINSZ  # unavailable on IRIX (issue3449)
     except (AttributeError, ImportError):
         return 80, 24
 
     for dev in (ui.ferr, ui.fout, ui.fin):
         try:
             try:
                 fd = dev.fileno()
             except AttributeError:
                 continue
             if not os.isatty(fd):
                 continue
             arri = fcntl.ioctl(fd, TIOCGWINSZ, '\0' * 8)
-            height, width = array.array('h', arri)[:2]
+            height, width = array.array(r'h', arri)[:2]
             if width > 0 and height > 0:
                 return width, height
         except ValueError:
             pass
         except IOError as e:
             if e[0] == errno.EINVAL:
                 pass
             else:
                 raise
     return 80, 24