Revert "Revert most of "9899 cw(1onbld) should shadow more compilation""
This reverts commit 67deef8cbc83060db238a0f4ee252d1ba74641ef.

*** 62,74 ****
  SHADOW COMPILATION
       If --shadow compilers are specified cw will invoke each shadow compiler,
       with the outputs modified (as well as any translation for compiler style)
       as follows:
  
!      1.   If neither of -c, -S appears in the argument list (that is, linking
!           is attempted or only the pre-processor is invoked), the shadow
!           compilers will not be invoked.
  
       2.   If the -o filename option was provided, with or without a separating
            space, it will be replaced with -o tempfile
  
       3.   If the option -o was not provided, -o tempfile will be added to the
--- 62,73 ----
  SHADOW COMPILATION
       If --shadow compilers are specified cw will invoke each shadow compiler,
       with the outputs modified (as well as any translation for compiler style)
       as follows:
  
!      1.   If cw is invoked to link-edit without compilation (the input files
!           are all objects), the shadow compiler is not invoked.
  
       2.   If the -o filename option was provided, with or without a separating
            space, it will be replaced with -o tempfile
  
       3.   If the option -o was not provided, -o tempfile will be added to the