Use short hostname for file naming

dotfiles.config/Xlib/bin/setup

 #!/bin/bash
 
-host=`hostname`
+host=`hostname -s`
 
 cat<<EOF > $HOME/.Xdefaults
 !! This file is generated by .config/Xlib/bin/setup

dotfiles/bash/setup/bashrc.diff

 +    source "${HOME}/.bash/user/$(whoami).bashrc";
 +fi
 +
-+if [ -x "${HOME}/.bash/host/$(hostname).bashrc" ]; then
-+    source "${HOME}/.bash/host/$(hostname).bashrc";
++if [ -x "${HOME}/.bash/host/$(hostname -s).bashrc" ]; then
++    source "${HOME}/.bash/host/$(hostname -s).bashrc";
 +fi
 +
 +if [ -x "${HOME}/.bash/global-after.bashrc" ]; then

dotfiles/git-universe/bin/setup

     tilde=$HOME
 fi
 
-host=`hostname`
+host=`hostname -s`
 user=`whoami`
 
 printf "[include]\n" >> ~/.gitconfig