Vendor go-xdg

A few other changes

ext/go-xdg/.bzr/repository/format

@@ -0,0 +1 @@
+Bazaar repository format 2a (needs bzr 1.16 or later)

ext/go-xdg/.bzr/repository/indices/d61ea2acf68934c72101b4363af27ab1.six

@@ -0,0 +1,8 @@
+B+Tree Graph Index 2
+node_ref_lists=0
+key_elements=1
+len=10
+row_lengths=1
+x<EFBFBD><EFBFBD><EFBFBD>;<3B><>0<06><>{
+.<2E><>e<EFBFBD>E<EFBFBD>3{c<>Gbp 8N<><4E><EFBFBD>tШ<74><D0A8><EFBFBD>/<2F><><EFBFBD><EFBFBD>
+ޔ?<3F>Xw<58><77><EFBFBD>1v<76>t<EFBFBD>k<EFBFBD>	W[<5B>(p