Create the "racket-extra-test" to reduce dependencies.

It initially contains the two tests that use redex-driven random
testing.

pkgs/racket-extra-test/info.rkt

@@ -0,0 +1,10 @@
+#lang info
+
+(define collection 'multi)
+
+(define pkg-desc "Additional Racket test suites")
+
+(define pkg-authors '(eli jay matthias mflatt robby ryanc samth))
+(define build-deps '("base"
+                     "redex-lib"
+                     "scheme-lib"))

pkgs/racket-test/info.rkt

@@ -21,10 +21,7 @@
                "at-exp-lib"
 
                ;; used to test setup, module readers, pkg system
-               "scribble-lib"
-
-               ;; for random testing:
-               "redex-lib"))
+               "scribble-lib"))
 
 (define build-deps '("racket-index"
                      "scheme-lib"