Under certain circumstances, not all of the macro files were

Under certain circumstances, not all of the macro files were
copied into the destination directory.  This changeset fixes
that bug:

* libtoolize.m4sh (func_serial_update):  Renamed local variable
`my_update_p' to `my_serial_update_p', and initialise it correctly
even when the destination file is not yet there.
Reported by Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>