Kill /usr/share/getopt

This directory had example scripts for util-linux's getopt.  They count
as documentation and don't belong on an embedded rootfs.

This also reduces the diff to RescueOS v1.1; this directory was
(presumably manually) removed there as well.

Also cleanup post-build.sh a bit while we're at it.

post-build.sh

@@ -4,11 +4,14 @@ set -e
 
 target="$1"
 
-delfiles=" \
-  $target/etc/init.d/rcK \
-  $target/etc/init.d/S20urandom \
-  $target/etc/init.d/S40network \
+delfiles="
+  $target/etc/init.d/rcK
+  $target/etc/init.d/S20urandom
+  $target/etc/init.d/S40network
   $target/etc/securetty"
+
 for file in $delfiles ; do 
-  [ -e "$file" ] && rm "$file" || true
+  [ ! -e "$file" ] || rm "$file"
 done
+
+[ ! -e "$target/usr/share/getopt" ] || rm -r "$target/usr/share/getopt"