Don't touch any files in bootstrap

configure.ac already exists. Its timestamp doesn't need to be updated.
autoreconf takes care of the timestamps.

Since "foreign" is used in Makefile.am, no standard GNU files are
required. Distributing empty files like README could be disappointing for
the users.

bootstrap

@@ -28,9 +28,4 @@ then
   exit 1
 fi
 
-touch configure.ac
-touch NEWS
-touch AUTHORS
-touch README
-touch ChangeLog
 autoreconf -fvi