* untar/Makefile.am: Use 'PREINSTALL_FILES ='.
* monitor/Makefile.am: Use 'PREINSTALL_FILES ='.
* shell/Makefile.am: Use 'PREINSTALL_FILES ='.
* devnull/Makefile.am: Use 'PREINSTALL_FILES ='.
* dumpbuf/Makefile.am: Use 'PREINSTALL_FILES ='.
* mw-fb/Makefile.am: Use 'PREINSTALL_FILES ='.
* stackchk/Makefile.am: Use 'PREINSTALL_FILES ='.
* rtmonuse/Makefile.am: Use 'PREINSTALL_FILES ='.
* cpuuse/Makefile.am: Use 'PREINSTALL_FILES ='.
* rootfs/Makefile.am: Use 'PREINSTALL_FILES ='.
* devnull/devnull.c (null_initialize): Added check to
ensure that the driver is only initialized once. Otherwise,
it will abort when the device /dev/null is present.
(null_write): Do not dereference a NULL pointer.
* devnull: New addition. Moved from libcpu/sh.
* devnull/devnull.c, devnull/devnull.h, devnull/.cvsignore,
devnull/Makefile.am: New files.
* Makefile.am, configure.in, wrapup/Makefile.am: Modified to reflect
addition of above.