spec: Don't pull in dependencies for example scripts

If the scripts are marked as executable, RPM magic will scan them
for dependencies, which can pull in python2 for the python3 package

libvirt-python.spec.in

@@ -49,6 +49,11 @@ of recent versions of Linux (and other OSes).
 %prep
 %setup -q
 
+# Unset execute bit for example scripts; it can introduce spurious
+# RPM dependencies, like /usr/bin/python which can pull in python2
+# for the -python3 package
+find examples -type f -exec chmod 0644 \{\} \;
+
 %build
 CFLAGS="$RPM_OPT_FLAGS" %{__python} setup.py build
 %if %{with_python3}