kconfig: tell git to ignore new generated files

The update of kconfig and the addition of xconfig support generates
more files in package/config/. Tell git to ignore them.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/config/.gitignore

@@ -1,6 +1,10 @@
 /buildroot-config
 /conf
 /mconf
+/qconf
+/qconf.moc
+/.tmp_qtcheck
+/lkc_defs.h
 /lex.zconf.c
 /zconf.hash.c
 /zconf.tab.c