Added a workaround for locale-gen issue (#517400)

src/root/setup

@@ -15,6 +15,8 @@ patch_ebuild() {
 
 rebuild_locales() {
     grep UTF-8 /usr/share/i18n/SUPPORTED > /etc/locale.gen.new
+    # (#517400), http://comments.gmane.org/gmane.comp.lib.glibc.alpha/31543
+    sed -i '/^bo_/d' /etc/locale.gen.new
     if cmp -s /etc/locale.gen{.new,}; then
         rm /etc/locale.gen.new
     else