Fix broken make clean when using Icarus
ifeq ($(SIM),)
all:
@echo "Skipping example mixed_language since Icarus doesn't support this"
+clean::
else ifeq ($(shell echo $(SIM) | tr A-Z a-z),icarus)
all:
@echo "Skipping example mixed_language since Icarus doesn't support this"
+clean::
else
# Override this variable to use a VHDL toplevel instead of SystemVerilog
