Unmark files as executable that can't actually be executed. (GH-15353)

There are plenty of legitimate scripts in the tree that begin with a
`#!`, but also a few that seem to be marked executable by mistake.

Found them with this command -- it gets executable files known to Git,
filters to the ones that don't start with a `#!`, and then unmarks
them as executable:

    $ git ls-files --stage \
      | perl -lane 'print $F[3] if (!/^100644/)' \
      | while read f; do
          head -c2 "$f" | grep -qxF '#!' \
          || chmod a-x "$f"; \
        done

Looking at the list by hand confirms that we didn't sweep up any
files that should have the executable bit after all.  In particular

 * The `.psd` files are images from Photoshop.

 * The `.bat` files sure look like things that can be run.
   But we have lots of other `.bat` files, and they don't have
   this bit set, so it must not be needed for them.

Automerge-Triggered-By: @benjaminp

diff --git a/.azure-pipelines/posix-deps-apt.sh b/.azure-pipelines/posix-deps-apt.sh
index 4f489903ab569b6464a68c6031bbc52e8138a75d..e0f4ca5d8d8e88602a543225193da0624cd26b76 100755 (executable)
--- a/.azure-pipelines/posix-deps-apt.sh
+++ b/.azure-pipelines/posix-deps-apt.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 apt-get update
 
 apt-get -yq install \

diff --git a/Doc/c-api/buffer.rst b/Doc/c-api/buffer.rst
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Include/cpython/abstract.h b/Include/cpython/abstract.h
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Lib/idlelib/idle.bat b/Lib/idlelib/idle.bat
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Lib/test/test_buffer.py b/Lib/test/test_buffer.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Lib/test/test_dataclasses.py b/Lib/test/test_dataclasses.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Lib/test/test_importlib/test_abc.py b/Lib/test/test_importlib/test_abc.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Lib/turtledemo/two_canvases.py b/Lib/turtledemo/two_canvases.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Mac/Resources/iconsrc/PythonCompiled.psd b/Mac/Resources/iconsrc/PythonCompiled.psd
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Mac/Resources/iconsrc/PythonIcon.psd b/Mac/Resources/iconsrc/PythonIcon.psd
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Mac/Resources/iconsrc/PythonSource.psd b/Mac/Resources/iconsrc/PythonSource.psd
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Misc/NEWS.d/next/Documentation/2019-04-02-19-23-00.bpo-36487.Jg6-MG.rst b/Misc/NEWS.d/next/Documentation/2019-04-02-19-23-00.bpo-36487.Jg6-MG.rst
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Modules/_decimal/tests/runall.bat b/Modules/_decimal/tests/runall.bat
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/Modules/socketmodule.h b/Modules/socketmodule.h
old mode 100755 (executable)
new mode 100644 (file)