gnulib: update

* Makefile.am (gitsort): New.
Use it.

doc/.gitignore

@@ -22,15 +22,15 @@
 /bison.ps
 /cross-options.texi
 /fdl.texi
+/figs/*.eps
+/figs/*.svg
 /gendocs_template
 /gendocs_template_min
 /gpl-3.0.texi
 /refcard.dvi
 /refcard.log
 /refcard.ps
+/relocatable.texi
 /stamp-vti
 /version.texi
 /yacc.1
-/relocatable.texi
-/figs/*.eps
-/figs/*.svg