add the new EpicsHostArch.pl path additionally

configure/E3/CONFIG_EXPORT

 # Variables should be transferred to module_name.makefile
 
 EPICS_HOST_ARCH:=$(shell $(EPICS_BASE)/startup/EpicsHostArch.pl)
+# In near future, BASE may drop "startup" directory, so
+#
+ifeq ($(strip $(EPICS_HOST_ARCH)),)
+EPICS_HOST_ARCH:=$(shell perl $(EPICS_BASE)/lib/perl/EpicsHostArch.pl)
+endif
+
 MSI:=$(EPICS_BASE)/bin/$(EPICS_HOST_ARCH)/msi
 
 EXPORT_VARS+=EPICS_HOST_ARCH
@@ -14,6 +20,7 @@ EXPORT_VARS+=E3_SITELIBS_PATH
 EXPORT_VARS+=E3_SEQUENCER_NAME
 EXPORT_VARS+=E3_SEQUENCER_VERSION
 
+
 EXPORT_VARS+=QUIET
 EXPORT_VARS+=$(filter %_DEP_VERSION,$(.VARIABLES))
 EXPORT_VARS+=$(filter WITH_%,$(.VARIABLES))
@@ -23,4 +30,3 @@ export_version=$(eval export $1)
 $(eval $(foreach v,$(EXPORT_VARS),$(call export_version,$v)))
 
 VARS_EXCLUDES+=export_version
-