makefile: cleanup, make has lazy evaluation

no need to duplicate things, make has lazy evaluation which we
rely on for many things, such as LIB_FILES

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/Makefile

@@ -85,10 +85,7 @@
 # Default design
 DESIGN_CONFIG ?= ./designs/nangate45/gcd/config.mk
 
-# default value "base" is duplicated from variables.yaml because we need it
-# earlier in the flow for BLOCKS. BLOCKS is a feature specific to Makefile
-# that will not be ported to bazel-orfs.
-export FLOW_VARIANT?=base
+# BLOCKS is a ORFS make flow specific feature.
 ifneq ($(BLOCKS),)
   # Normally this comes from variables.yaml, but we need it here to set up these variables
   # which are part of the DESIGN_CONFIG. BLOCKS is a Makefile specific concept.