Remove the use of desktop-file-install and its vendor prefix override

Instead, just validate the desktop file in %check.

gnome-system-monitor.spec

@@ -47,15 +47,12 @@ make %{?_smp_mflags}
 %install
 make install DESTDIR=$RPM_BUILD_ROOT
 
-desktop-file-install --vendor gnome --delete-original       \
-  --dir $RPM_BUILD_ROOT%{_datadir}/applications             \
-  --remove-category Application                             \
-  $RPM_BUILD_ROOT%{_datadir}/applications/*
-
-rm -rf $RPM_BUILD_ROOT/var/scrollkeeper
-
 %find_lang %{name} --with-gnome
 
+%check
+desktop-file-validate $RPM_BUILD_ROOT%{_datadir}/applications/gnome-system-monitor.desktop
+desktop-file-validate $RPM_BUILD_ROOT%{_datadir}/applications/gnome-system-monitor-kde.desktop
+
 %postun
 if [ $1 -eq 0 ]; then
   glib-compile-schemas %{_datadir}/glib-2.0/schemas &>/dev/null || :
@@ -67,7 +64,8 @@ glib-compile-schemas %{_datadir}/glib-2.0/schemas &>/dev/null || :
 %files -f %{name}.lang
 %doc AUTHORS NEWS COPYING README
 %{_bindir}/gnome-system-monitor
-%{_datadir}/applications/*
+%{_datadir}/applications/gnome-system-monitor.desktop
+%{_datadir}/applications/gnome-system-monitor-kde.desktop
 %{_datadir}/pixmaps/gnome-system-monitor/
 %{_datadir}/glib-2.0/schemas/org.gnome.gnome-system-monitor.enums.xml
 %{_datadir}/glib-2.0/schemas/org.gnome.gnome-system-monitor.gschema.xml