4027 remove CLOSED_BUILD

*** 35,49 ****
  #
  # INTERNAL_RELEASE_BUILD is a subset of RELEASE_BUILD. It mostly controls
  # identification strings. Enabling RELEASE_BUILD automatically enables
  # INTERNAL_RELEASE_BUILD.
  #
- # CLOSED_BUILD controls whether we try to build files under
- # usr/closed.  ("" means to build closed code, "#" means don't try to
- # build it.)  Skipping the closed code implies doing an export release
- # build.
- #
  # STRIP_COMMENTS toggles comment section striping. Generally the same setting
  # as INTERNAL_RELEASE_BUILD.
  #
  # __GNUC toggles the building of ON components using gcc and related tools.
  # Normally set to `#', set it to `' to do gcc build.
--- 35,44 ----
*** 68,81 ****
  RELEASE_BUILD=                          $(POUND_SIGN)
  $(RELEASE_BUILD)NOT_RELEASE_BUILD=      $(POUND_SIGN)
  $(RELEASE_BUILD)INTERNAL_RELEASE_BUILD=
  PATCH_BUILD=                            $(POUND_SIGN)
  
- # If CLOSED_IS_PRESENT is not set, assume the closed tree is present.
- CLOSED_BUILD_1= $(CLOSED_IS_PRESENT:yes=)
- CLOSED_BUILD=   $(CLOSED_BUILD_1:no=$(POUND_SIGN))
- 
  # SPARC_BLD is '#' for an Intel build.
  # INTEL_BLD is '#' for a Sparc build.
  SPARC_BLD_1=    $(MACH:i386=$(POUND_SIGN))
  SPARC_BLD=      $(SPARC_BLD_1:sparc=)
  INTEL_BLD_1=    $(MACH:sparc=$(POUND_SIGN))
--- 63,72 ----