Move .Xdefaults to separate, host-specific configuration

dotfiles.config/Xlib/bin/setup

+#!/bin/bash
+
+host=`hostname`
+
+cat<<EOF > $HOME/.Xdefaults
+!! This file is generated by .config/Xlib/bin/setup
+!! from mydots.  Changes are not tracked by mydots.
+
+# include "$HOME/.config/Xlib/global.Xdefaults"
+# include "$HOME/.config/Xlib/host/${host}.Xdefaults"
+EOF

dotfiles/Xdefaults → dotfiles.config/Xlib/global.Xdefaults

 !## ==== ##
 
 
-URxvt.geometry:             90x24
-
 !## extensions
 URxvt.perl-ext-common:      default,tabbed,selection
 URxvt.tabbed.tab-fg:        7
 URxvt.scrollWithBuffer:     true
 URxvt.saveLines:            32767
 
-!## font
-URxvt.font:     xft:Dejavu Sans Mono:pixelsize=13
-URxvt.boldFont: xft:Dejavu Sans Mono:pixelsize=13:style=Bold
 URxvt.cursorUnderline:      false
 URxvt.cursorBlink:          true
 URxvt.pointerBlankDelay:    999999999

dotfiles.config/Xlib/host/hugo.Xdefaults

+URxvt.geometry: 90x27
+URxvt.font:     xft:Dejavu Sans Mono:pixelsize=11:antialias=false
+URxvt.boldFont: xft:Dejavu Sans Mono:pixelsize=11:antialias=false:style=Bold