Parallel collects build (process-based) "raco setup -u"

original commit: 35c28f4f66

collects/compiler/sig.rkt

@@ -79,6 +79,7 @@
 
    compile-collection-zos
    compile-directory-zos
+   compile-directory-srcs
 
    current-compiler-dynamic-require-wrapper
    compile-notify-handler))

collects/compiler/zo-marshal.rkt

@@ -1,6 +1,6 @@
 #lang scheme/base
 (require compiler/zo-structs
-         unstable/byte-counting-port
+         scheme/port
          scheme/match
          scheme/contract
          scheme/local
@@ -68,7 +68,7 @@
                (out-data (list* max-let-depth prefix (protect-quote form)) 
                          (make-out outp (lambda (v) (hash-ref shared v #f)) wrapped))
                (values offsets post-shared (file-position outp)))
-             (define counting-p (make-byte-counting-port))
+             (define counting-p (open-output-nowhere))
              (define-values (offsets post-shared all-forms-length)
                (write-all counting-p))
              (define all-short? (post-shared . < . #xFFFF))

collects/setup/option-sig.rkt

@@ -21,6 +21,8 @@
      call-install
      call-post-install
      pause-on-errors
+     parallel-build
+     parallel-workers
      force-unpacks
      doc-pdf-dest
      specific-collections