Do not use %exclude for unpackaged files (RPM 4.17 compatibility)

gn.spec

@@ -142,6 +142,8 @@ install -t '%{buildroot}%{_bindir}' -p out/%{name}
 
 install -d '%{buildroot}%{_datadir}/vim/vimfiles'
 cp -vrp misc/vim/* '%{buildroot}%{_datadir}/vim/vimfiles'
+find '%{buildroot}%{_datadir}/vim/vimfiles' \
+    -type f -name 'README.*' -print -delete
 %py_byte_compile %{__python3} '%{buildroot}%{_datadir}/vim/vimfiles/%{name}-format.py'
 
 install -d '%{buildroot}%{_emacs_sitestartdir}'
@@ -169,7 +171,6 @@ grep -E '^#define[[:blank:]]+LAST_COMMIT_POSITION[[:blank:]]+'\
 
 %{_mandir}/man1/%{name}.1*
 
-%exclude %{_datadir}/vim/vimfiles/README.*
 %{_datadir}/vim/vimfiles/%{name}-format.py
 %{_datadir}/vim/vimfiles/autoload/%{name}.vim
 %{_datadir}/vim/vimfiles/ftdetect/%{name}filetype.vim