Mark files as executable that are meant as scripts. (GH-15354)

This is the converse of GH-15353 -- in addition to plenty of
scripts in the tree that are marked with the executable bit
(and so can be directly executed), there are a few that have
a leading `#!` which could let them be executed, but it doesn't
do anything because they don't have the executable bit set.

Here's a command which finds such files and marks them.  The
first line finds files in the tree with a `#!` line *anywhere*;
the next-to-last step checks that the *first* line is actually of
that form.  In between we filter out files that already have the
bit set, and some files that are meant as fragments to be
consumed by one or another kind of preprocessor.

    $ git grep -l '^#!' \
      | grep -vxFf <( \
          git ls-files --stage \
          | perl -lane 'print $F[3] if (!/^100644/)' \
        ) \
      | grep -ve '\.in$' -e '^Doc/includes/' \
      | while read f; do
          head -c2 "$f" | grep -qxF '#!' \
          && chmod a+x "$f"; \
        done

11 files changed, 0 insertions, 0 deletions

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 9a22e56..9a22e56 100644..100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
diff --git a/Lib/turtledemo/__main__.py b/Lib/turtledemo/__main__.py
index 17fe9a7..17fe9a7 100644..100755
--- a/Lib/turtledemo/__main__.py
+++ b/Lib/turtledemo/__main__.py
diff --git a/Lib/turtledemo/sorting_animate.py b/Lib/turtledemo/sorting_animate.py
index d25a0ab..d25a0ab 100644..100755
--- a/Lib/turtledemo/sorting_animate.py
+++ b/Lib/turtledemo/sorting_animate.py
diff --git a/Misc/python-wing3.wpr b/Misc/python-wing3.wpr
index abe7894..abe7894 100644..100755
--- a/Misc/python-wing3.wpr
+++ b/Misc/python-wing3.wpr
diff --git a/Misc/python-wing4.wpr b/Misc/python-wing4.wpr
index 7adfdbd..7adfdbd 100644..100755
--- a/Misc/python-wing4.wpr
+++ b/Misc/python-wing4.wpr
diff --git a/Misc/python-wing5.wpr b/Misc/python-wing5.wpr
index 0e1ae63..0e1ae63 100644..100755
--- a/Misc/python-wing5.wpr
+++ b/Misc/python-wing5.wpr
diff --git a/PCbuild/fix_encoding.py b/PCbuild/fix_encoding.py
index 60a892a..60a892a 100644..100755
--- a/PCbuild/fix_encoding.py
+++ b/PCbuild/fix_encoding.py
diff --git a/PCbuild/get_external.py b/PCbuild/get_external.py
index a682d38..a682d38 100644..100755
--- a/PCbuild/get_external.py
+++ b/PCbuild/get_external.py
diff --git a/PCbuild/prepare_ssl.py b/PCbuild/prepare_ssl.py
index 0f3c63e..0f3c63e 100644..100755
--- a/PCbuild/prepare_ssl.py
+++ b/PCbuild/prepare_ssl.py
diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index f4fa271..f4fa271 100644..100755
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
diff --git a/Tools/scripts/generate_token.py b/Tools/scripts/generate_token.py
index f2745e8..f2745e8 100644..100755
--- a/Tools/scripts/generate_token.py
+++ b/Tools/scripts/generate_token.py