Merge of the normal Dropbear makefile:

	- Don't include mpi.o, since it does Bad Things (tm) (wrt LTM)
	- Don't try to make clean in tests if it doesn't exist (infinite looping
	  makefiles, mmmmm)

--HG--
branch : libtomcrypt
extra : convert_revision : 2e048f798d212ab751471d7c19b5893745ce0e19