Make documentation scripts non-executable

Fixes autogenerating Python 2 dependency in sympy-examples (#1360766)

sympy.spec

@@ -1,6 +1,6 @@
 Name:           sympy
 Version:        1.0
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        A Python library for symbolic mathematics
 License:        BSD
 URL:            http://sympy.org/
@@ -183,7 +183,7 @@ cp -a data/TeXmacs/progs %{buildroot}%{_datadir}/TeXmacs/plugins/sympy
 chmod a-x %{buildroot}%{_datadir}/TeXmacs/plugins/sympy/progs/*.scm
 
 # Don't let an executable script go into the documentation
-chmod a-x examples/all.py
+chmod -R a-x+X examples
 
 # Convert the README to HTML
 rst2html --no-datestamp README.rst README.html
@@ -248,6 +248,10 @@ popd
 %{_docdir}/%{name}-doc/html
 
 %changelog
+* Fri Jan 20 2017 Iryna Shcherbina <ishcherb@redhat.com> - 1.0-5
+- Make documentation scripts non-executable to avoid
+  autogenerating Python 2 dependency in sympy-examples (#1360766)
+
 * Fri Jan 13 2017 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 1.0-4
 - Run tests in parallel
 - Work around some broken tests