Remove a few no longer usefull files in tools.

* tools/ltpupdate

  A script to update ltp from CVS on remote machine.

  Does not work for a few years now.

* tools/build/*

  Script and patch to find out problems in build system.

  No longer useful.

* tools/mkrootfs/*

  A script to create a basesystem on floppy to boot
  PPC32 F50 machine.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Move test_safe_macros.c to lib/tests/

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>