strip trailing spaces when reading autogen.input/lastrun

Change-Id: I9d47d2d4c6d2eb14968bfd79ef2a406c57afa21d

autogen.sh

@@ -77,6 +77,7 @@ sub read_args($)
     open ($fh, $file) || die "can't open file: $file";
     while (<$fh>) {
         chomp();
+        s/\s+$//;
         # migrate from the old system
         if ( substr($_, 0, 1) eq "'" ) {
             print STDERR "Migrating options from the old autogen.lastrun format, using:\n";