better error testing on perverse cases (eg, ./config.sub -sun3)

ChangeLog

@@ -1,3 +1,8 @@
+Sat May 30 21:01:06 1992  david d `zoo' zuhn  (zoo at cirdan.cygnus.com)
+
+	* config.sub (basic_machine): fix sed so that '-foo' isn't
+	completely substituted out while .+'-foo' loses the '-foo'
+
 Thu May 28 19:48:35 1992  Michael Tiemann  (tiemann@rtl.cygnus.com)
 
 	* .Sanitize: Add flex to the list of keepers.  flex is needed to

config.sub

@@ -46,7 +46,7 @@ case $1 in
 esac
 
 # Separate what the user gave into CPU-COMPANY and OS (if any).
-basic_machine=`echo $1 | sed 's/-[^-]*$//'`
+basic_machine=`echo $1 | sed 's/-[^-]+$//'`
 if [ $basic_machine != $1 ]
 then os=`echo $1 | sed 's/.*-/-/'`
 else os=; fi