Genericize native build. Break out dropbear and strace packages from download.sh (and clean up what remains, mirror list is now in include.sh). New script setup-native.build.sh downloads, extracts, and creates a system image with "here document" build script to build dropbear and strace. New native-build.sh script works on arbitrary hdc image, providing FTP upload to a directory. The setup/fork logic to build all architectures is now in buildall.sh for this, just like everything else. Update buildall.sh to take optional list of architectures to build on command line. Factor out unique-port.sh (in embeddable manner) so distcc (in run-emulator.sh) and ftp server (in native-build.sh) can both use it. Upgrade to new busybox version while we're there. HGi removed sources/more/setup-native-static-build.sh

--- a/sources/include.sh	Fri Feb 05 07:11:11 2010 -0600
+++ b/sources/include.sh	Fri Feb 05 10:33:06 2010 -0600
@@ -9,6 +9,10 @@
 
 source sources/functions.sh
 
+# List of fallback mirrors to download package source from
+
+MIRROR_LIST="http://impactlinux.com/firmware/mirror http://landley.net/code/firmware/mirror http://127.0.0.1/code/firmware/mirror"
+
 # Where are our working directories?
 
 TOP=`pwd`