Revert "update betz (to implement pickle) and add its test"

This reverts commit ae450b95b9.

extlib/benz

@@ -1 +1 @@
-Subproject commit a7ae88e224b797d2f094ff8c093b6bf5fbe5e7b7
+Subproject commit 15889a5feb515bd67ee7dc2c6419d16703151a54

t/pickle.scm

@@ -1,46 +0,0 @@
-(import (picrin base)
-        (picrin test))
-
-(define (id obj) (unpickle (pickle obj)))
-
-(test #f (id #f))
-(test #t (id #t))
-(test 1 (id 1))
-(test -1 (id -1))
-(test 128 (id 128))
-(test -128 (id -128))
-(test 256 (id 256))
-(test -256 (id -256))
-(test 65536 (id 65536))
-(test -65536 (id -65536))
-(test 4294967296 (id 4294967296 ))
-(test -4294967296 (id -4294967296 ))
-
-(test 1.0 (id 1.0))
-(test -1.0 (id -1.0))
-(test (/ 3) (id (/ 3)))
-(test (/ -3) (id (/ -3)))
-
-(test #\a (id #\a))
-
-(test "" (id ""))
-(test (make-string 1 #\a) (id (make-string 1 #\a)))
-(test (make-string 32 #\a) (id (make-string 32 #\a)))
-(test (make-string 256 #\a) (id (make-string 256 #\a)))
-(test (make-string 65536 #\a) (id (make-string 65536 #\a)))
-
-(test () (id ()))
-(test (make-list 1 1) (id (make-list 1 1)))
-(test (make-list 16 1) (id (make-list 16 1)))
-#;(test (make-list 65536 1) (id (make-list 65536 1)))
-
-(test #() (id #()))
-(test (make-vector 1 1) (id (make-vector 1 1)))
-(test (make-vector 16 1) (id (make-vector 16 1)))
-(test (make-vector 65536 1) (id (make-vector 65536 1)))
-
-(test #u8() (id #u8()))
-(test (make-bytevector 1 1) (id (make-bytevector 1 1)))
-(test (make-bytevector 16 1) (id (make-bytevector 16 1)))
-(test (make-bytevector 256 1) (id (make-bytevector 256 1)))
-(test (make-bytevector 65536 1) (id (make-bytevector 65536 1)))