4027 remove CLOSED_BUILD

@@ -35,15 +35,10 @@
 #
 # 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.

@@ -68,14 +63,10 @@
 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))