export DESIGN_CONFIG from Makefile

Ubuntu22 otherwise fails during make issue with

flow/util/makeIssue.sh: line 99: DESIGN_CONFIG: unbound variable

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

flow/Makefile

@@ -210,6 +210,7 @@ export DPO_MAX_DISPLACEMENT ?= 5 1
 # Setup working directories
 export DESIGN_NICKNAME ?= $(DESIGN_NAME)
 
+export DESIGN_CONFIG
 export DESIGN_DIR  = $(dir $(DESIGN_CONFIG))
 export LOG_DIR     = $(WORK_HOME)/logs/$(PLATFORM)/$(DESIGN_NICKNAME)/$(FLOW_VARIANT)
 export OBJECTS_DIR = $(WORK_HOME)/objects/$(PLATFORM)/$(DESIGN_NICKNAME)/$(FLOW_VARIANT)