package: add htop package

Changes made based upon e-mails with Mike Frysinger and Gerhard Heift. The
autoreconf change is important for anyone using uClibc as there is no widely
available backtrace (yet).

[Peter: fix Config.in indentation, autoreconf, patch]
Signed-off-by: Andy Kennedy <Andy.Kennedy@AdTran.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>