configure: ensure output file only updated on success

eg. After running "false > $@", the output file modification
time will be updated.  So a despite failure, a repeated
"make" will not re-run.

Handle this by accumulating output to "$@.tmp", then
move to $@ as a final step.

modules/database/src/ioc/db/RULES

@@ -15,8 +15,8 @@ THESE_RULES := $(IOCDIR)/db/RULES
 
 dbCommon.h$(DEP): $(COMMON_DIR)/dbCommonRecord.dbd $(THESE_RULES) \
     $(DBDTORECTYPEH_dep)
-	@$(RM) $@
-	@$(DBTORECORDTYPEH) -D -I ../db  -I $(COMMON_DIR) -o $(COMMONDEP_TARGET) $< > $@
+	@$(DBTORECORDTYPEH) -D -I ../db  -I $(COMMON_DIR) -o $(COMMONDEP_TARGET) $< > $@.stdout
+	$(MV) $@.stdout $@
 
 $(COMMON_DIR)/dbCommonRecord.html: ../db/dbCommon.dbd.pod
 

modules/database/src/std/rec/RULES

@@ -8,8 +8,8 @@
 # This is a Makefile fragment, see src/ioc/Makefile.
 
 stdRecords.dbd$(DEP): $(STDDIR)/rec/Makefile $(STDDIR)/rec/RULES
-	@$(RM) $@
-	@echo "$(COMMON_DIR)/stdRecords.dbd:" > $@
+	@echo "$(COMMON_DIR)/stdRecords.dbd:" > $@.stdout
+	$(MV) $@.stdout $@
 
 $(COMMON_DIR)/stdRecords.dbd: $(STDDIR)/rec/Makefile $(STDDIR)/rec/RULES
 

modules/database/src/std/softIoc/RULES

@@ -19,5 +19,5 @@ softMain$(DEP): epicsInstallDir.h
 
 epicsInstallDir.h: $(TOP)/configure/CONFIG_SITE*
 	$(ECHO) "FINAL_LOCATION=$(FINAL_LOCATION)"
-	$(PERL) $(STDDIR)/softIoc/makeInstallDir.pl "$(FINAL_LOCATION)" > $@
-
+	$(PERL) $(STDDIR)/softIoc/makeInstallDir.pl "$(FINAL_LOCATION)" > $@.stdout
+	$(MV) $@.stdout $@