Remove pconvert dependency in tests

The test just tests whether struct properties
work and it's not important what the precise
property is.

typed-racket-test/info.rkt

@@ -10,7 +10,6 @@
                "2d"
                "rackunit-lib"
                "racket-index"
-               "pconvert-lib"
                "compatibility-lib"
                "math-lib"))
 (define build-deps '("scheme-lib"

typed-racket-test/succeed/custom-printer.rkt

@@ -2,10 +2,8 @@
 ;; This test ensures that there is some way to customize struct
 ;; printouts -- if properties are removed or changed, there should be
 ;; some way to do something equivalent to what's done in this test.
-(require mzlib/pconvert-prop)
 (struct: foo ()
   #:property prop:custom-print-quotable 'never
-  #:property prop:print-convert-constructor-name 'foo
   #:property prop:custom-write (λ (x p w?) (display "#foo" p)))
 (unless (equal? "#foo #foo" (format "~a ~s" (foo) (foo)))
   (error "bad output"))