contrib/automation/linux-requirements.txt.in

procutils: don't try to get `.buffer` if sys.stdin is None

While hunting down following test failure of test-chg.t on Python 3, I stumbled
the case when `.buffer` is not available as sys.stdin is None.

	--- /home/pulkit/repo/hg-committed/tests/test-chg.t
	+++ /home/pulkit/repo/hg-committed/tests/test-chg.t.err
	@@ -203,7 +203,31 @@
	   $ CHGDEBUG=1 chg version -q 0<&-
		 chg: debug: * stdio fds are missing (glob)
	     chg: debug: * execute original hg (glob)
		 -  Mercurial Distributed SCM * (glob)
		 +  Traceback (most recent call last):
		 +    File "/tmp/hgtests.avspvsq4/install/bin/hg", line 43, in <module>
		 +      dispatch.run()
		 +    File "/usr/lib/python3.6/importlib/util.py", line 233, in
		 __getattribute__
		 +      self.__spec__.loader.exec_module(self)
		 +    File "<frozen importlib._bootstrap_external>", line 678, in
		 exec_module
		 +    File "<frozen importlib._bootstrap>", line 219, in
		 _call_with_frames_removed
		 +    File
		 "/tmp/hgtests.avspvsq4/install/lib/python/mercurial/dispatch.py", line
		 726, in <module>
		 +      class lazyaliasentry(object):
		 +    File
		 "/tmp/hgtests.avspvsq4/install/lib/python/mercurial/dispatch.py", line
		 737, in lazyaliasentry
		 +      @util.propertycache
		 +    File "/usr/lib/python3.6/importlib/util.py", line 233, in
		 __getattribute__
		 +      self.__spec__.loader.exec_module(self)
		 +    File "<frozen importlib._bootstrap_external>", line 678, in
		 exec_module
		 +    File "<frozen importlib._bootstrap>", line 219, in
		 _call_with_frames_removed
		 +    File "/tmp/hgtests.avspvsq4/install/lib/python/mercurial/util.py",
		 line 3473, in <module>
		 +      f=procutil.stderr,
		 +    File "/usr/lib/python3.6/importlib/util.py", line 233, in
		 __getattribute__
		 +      self.__spec__.loader.exec_module(self)
		 +    File "<frozen importlib._bootstrap_external>", line 678, in
		 exec_module
		 +    File "<frozen importlib._bootstrap>", line 219, in
		 _call_with_frames_removed
		 +    File
		 "/tmp/hgtests.avspvsq4/install/lib/python/mercurial/utils/procutil.py",
		 line 127, in <module>
		 +      stdin = sys.stdin.buffer
		 +  AttributeError: 'NoneType' object has no attribute 'buffer'
		 +  [1]

		  server lifecycle
		   ----------------

Differential Revision: https://phab.mercurial-scm.org/D9500

# black pulls in typed-ast, which doesn't install on PyPy.
black==19.10b0 ; python_version >= '3.6' and platform_python_implementation != 'PyPy'
# Bazaar doesn't work with Python 3 nor PyPy.
bzr ; python_version <= '2.7' and platform_python_implementation == 'CPython'
docutils
fuzzywuzzy
# isort 5.0 drops support for Python 3.5. We can remove this line when we
# drop support for 3.5.
isort < 5.0
pyflakes
pygments
pylint
# Needed to avoid warnings from fuzzywuzzy.
python-Levenshtein
# typed-ast dependency doesn't install on PyPy.
typed-ast ; python_version >= '3.0' and platform_python_implementation != 'PyPy'
vcrpy