Update references to build/core to build/make/core

sed -i -e 's"\([^/]\)build/core"\1build/make/core"g' $(git grep -l build/core)

Test: m checkbuild
Change-Id: Idf3a2fed79aee5d2c07bd8e42f0c0660f253ddc2
diff --git a/core/cleanbuild.mk b/core/cleanbuild.mk
index 64c5ae1..5576785 100644
--- a/core/cleanbuild.mk
+++ b/core/cleanbuild.mk
@@ -21,7 +21,7 @@
 TOP := .
 TOPDIR :=
 
-BUILD_SYSTEM := $(TOPDIR)build/core
+BUILD_SYSTEM := $(TOPDIR)build/make/core
 
 # Set up various standard variables based on configuration
 # and host information.
@@ -48,7 +48,7 @@
 #
 # $(1): shell command to run
 # $(2): indicate to not use makefile path as part of step id if not empty.
-#       $(2) should only be used in build/core/cleanspec.mk: just for compatibility.
+#       $(2) should only be used in build/make/core/cleanspec.mk: just for compatibility.
 define _add-clean-step
   $(if $(strip $(INTERNAL_CLEAN_BUILD_VERSION)),, \
       $(error INTERNAL_CLEAN_BUILD_VERSION not set))
@@ -67,7 +67,7 @@
   $(eval _acs_makefile_prefix :=)
 endef
 define add-clean-step
-$(eval # for build/core/cleanspec.mk, dont use makefile path as part of step id) \
+$(eval # for build/make/core/cleanspec.mk, dont use makefile path as part of step id) \
 $(if $(filter %/cleanspec.mk,$(lastword $(MAKEFILE_LIST))),\
     $(eval $(call _add-clean-step,$(1),true)),\
     $(eval $(call _add-clean-step,$(1))))