sync 2.2.0: missing dependency on format

[Mario Domenech Goulart]

salmonella synch shows an installation error:

'/home/mario/local/chicken-4.13.0/bin/csc' -feature compiling-extension -setup-mode    format-synch.scm -shared -optimize-leaf-routines
 -inline -output-file format-synch.so -emit-import-library format-synch -emit-type-file format-synch.types -optimize-level 3 -debug-level
 2

Warning: extension `format' is currently not installed

Syntax error (import): cannot import from undefined module

        format

        Expansion history:

        <syntax>          (use (srfi 18) (rename format (format single-format)) synch)
        <syntax>          (##core#require-extension ((srfi 18) (rename format (format single-format)) synch) #t)
        <syntax>          (##core#begin (##core#begin (##core#begin (##core#declare (uses srfi-18)) (import srfi-18))) (##core...
        <syntax>          (##core#begin (##core#begin (##core#declare (uses srfi-18)) (import srfi-18)))
        <syntax>          (##core#begin (##core#declare (uses srfi-18)) (import srfi-18))
        <syntax>          (##core#declare (uses srfi-18))
        <syntax>          (##core#begin (##core#undefined))
        <syntax>          (##core#undefined)
        <syntax>          (import srfi-18)
        <syntax>          (##core#undefined)
        <syntax>          (##core#begin (##core#begin (##sys#require (quote format)) (import (rename format (format single-for...
        <syntax>          (##core#begin (##sys#require (quote format)) (import (rename format (format single-format))))
        <syntax>          (##sys#require (quote format))
        <syntax>          (quote format)
        <syntax>          (##core#quote format)
        <syntax>          (import (rename format (format single-format)))       <--

[Kon Lovett]

fixed rel 2.2.1