guile: Add fake SRFI-19
r7b: Move (srfi iXX) => (r7b-compat iXX)
r7b: Complete library renaming
nmosh: Use local build of yuni
r7b: Move bytevector-buffer to i6bv to support native impl.
r7b: list-copy is SRFI-1
nmosh: Workaround renaming exports on (nmosh-r7b write)
r7b: Use implementation's define-values

Import reference implementation from R7RS.
chez: Add SRFI-1 member and assoc implementation
r7b: We do not need partial variants of vector procedures any longer
r7b: Follow latest R7RS
Racket: Racket's define-values is not R7RS compliant

Racket define-values do not support receiving list from values.

tests\r7rs\chibi-scheme\r7rs-tests-vu8.scm:541:21: define-values: not a sequence of identifiers
  at: x
  in: (define-values x (values 1 2))

Use R7RS reference implementation instead.