
Don't use --css-ref (not supported by base texinfo)

Index: doc/Makefile.in
--- doc/Makefile.in.orig
+++ doc/Makefile.in
@@ -527,7 +527,7 @@ gnupg_TEXINFOS = \
 	howtos.texi howto-create-a-server-cert.texi
 
 DVIPS = TEXINPUTS="$(srcdir)$(PATH_SEPARATOR)$$TEXINPUTS" dvips
-AM_MAKEINFOFLAGS = -I $(srcdir) --css-ref=/share/site.css
+AM_MAKEINFOFLAGS = -I $(srcdir)
 YAT2M_OPTIONS = -I $(srcdir) \
         --release "GnuPG @PACKAGE_VERSION@" --source "GNU Privacy Guard 2.2"
 
