Fix Python shebang in examples subpackage to avoid depending on Python2

The "/usr/bin/env python" shebang in maliit-exampleapp-gtk3-python.py executable is being mangled during build to "/usr/bin/python2" and is generating a dependency on Python 2. This PR replaces it with "/usr/bin/python3" so that the subpackage requires Python 3 only.

maliit-framework.spec

@@ -1,6 +1,6 @@
 Name:           maliit-framework
 Version:        0.94.2
-Release:        15%{?dist}
+Release:        16%{?dist}
 Summary:        Input method framework
 
 Group:          System Environment/Libraries
@@ -86,6 +86,9 @@ This package contains tests and examples for %{name}.
 %setup -q
 sed -i 's/ -O0//' config.pri
 
+# Fix shebang of maliit-exampleapp-gtk3-python.py executable to avoid depending on Python 2.
+sed -i '1s=^#!/usr/bin/env python=#!/usr/bin/python3=' examples/apps/gtk3-python/maliit-exampleapp-gtk3-python.py
+
 %build
 
 %{qmake_qt4} -r MALIIT_VERSION=%{version} PREFIX=%{_prefix} \
@@ -151,6 +154,9 @@ mkdir -p %{buildroot}%{_datadir}/maliit
 %{_libdir}/maliit-framework-tests
 
 %changelog
+* Mon Jun 04 2018 Iryna Shcherbina <shcherbina.iryna@gmail.com> - 0.94.2-16
+- Fix Python shebang in examples subpackage to avoid depending on Python2
+
 * Thu Feb 08 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.94.2-15
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild