adjust `raco ctool --c-mods' and related to work with places

That is, the generated declare_modules() function registers the
module-declaration code so that it is run in any new place, too.

Merge to 5.2.1

original commit: 481e061440

collects/compiler/zo-parse.rkt

@@ -1061,7 +1061,7 @@
   (define rst-start (file-position port))
 
   (file-position port (+ rst-start size*))
-
+ 
   (unless (eof-object? (read-byte port))
     (error 'zo-parse "File too big"))
 

collects/tests/racket/embed-place.rkt

@@ -0,0 +1,7 @@
+#lang racket/base
+(require racket/place)
+
+(provide go)
+
+(define (go ch)
+  (place-channel-put ch 42))