Make-system bug

[David A. Moon <Moon at SCRC-TENEX>]

In System 78.67, ZMail 38.8, Symbolics 8.15, Tape 6.5, LMFS 21.42, Canon
9.13, microcode 841, on Terrier:

If you do:

	(defsystem foobar
	  (:pathname-default "SCRC:<MOON>")
	  (:module frob ("NO-SUCH-FILE"))
	  (:readfile frob))
	(make-system 'foobar)

it comes back with no error, failing to detect that the filename was misspelled.
This happened to me in system 202 also (in fact it took until today to realize
that the reason it didn't work was a typo in the file name).

The same thing happens if the transformation is :compile-load