Make EXPAND rule work on all arch's

Fixes build for linux-arm in src/util.
Don't expand files unless specifically requested.
Expanded files are always precious.

configure/RULES_EXPAND

@@ -1,7 +1,5 @@
 # <top>/configure/RULES_EXPAND
 
-ifeq ($(findstring Host,$(VALID_BUILDS)),Host)
-
 # Default settings
 EXPAND_TOOL ?= $(PERL) $(TOOLS)/expandVars.pl
 
@@ -10,8 +8,6 @@ EXPANDFLAGS += $(addprefix -D ,$(EXPAND_VARS))
 
 EXPANDED = $(EXPAND:%@=%)
 
-buildInstall: $(EXPANDED)
-
 $(EXPANDED): %: ../%@
 	$(ECHO) "Expanding $< to $@"
 	@$(RM) $@
@@ -20,4 +16,4 @@ $(EXPANDED): %: ../%@
 clean::
 	@$(RM) $(EXPANDED)
 
-endif
+.PRECIOUS: $(EXPANDED)

src/util/Makefile

@@ -1,10 +1,10 @@
 #*************************************************************************
-# Copyright (c) 2002 The University of Chicago, as Operator of Argonne
+# Copyright (c) 2016 UChicago Argonne LLC, as Operator of Argonne
 #     National Laboratory.
 # Copyright (c) 2002 The Regents of the University of California, as
 #     Operator of Los Alamos National Laboratory.
 # EPICS BASE is distributed subject to a Software License Agreement found
-# in file LICENSE that is included with this distribution. 
+# in file LICENSE that is included with this distribution.
 #*************************************************************************
 TOP=../..
 
@@ -33,5 +33,3 @@ EXPAND += caRepeater.service@
 EXPAND_VARS = INSTALL_BIN=$(abspath $(INSTALL_BIN))
 
 include $(TOP)/configure/RULES
-
-.PRECIOUS: $(EXPANDED)