use coreutils `seq' instead of hacky `range'

Makefile.in

@@ -119,16 +119,6 @@ INSTALL_LIB   := $(INSTALL) -m 644
 INSTALL_EXE   := $(INSTALL) -m 555
 STOW          := @stow@
 
-#-------------------------------------------------------------------------
-# Range helper function.  $(call range,3,6) generates the string 3 4 5
-#-------------------------------------------------------------------------
-
-range = $(shell _i=$(1); \
-  while [ $$_i -le $(2) ]; do \
-    echo -n "$$_i "; \
-    _i=`expr $$_i + 1`; \
-  done)
-
 #-------------------------------------------------------------------------
 # Include subproject makefile fragments
 #-------------------------------------------------------------------------

riscv/riscv.mk.in

@@ -35,7 +35,7 @@ riscv_gen_hdrs = \
 	dispatch.h \
 
 NDISPATCH = 9
-DISPATCH_SRCS = $(addsuffix .cc,$(addprefix dispatch,$(call range,0,$(NDISPATCH))))
+DISPATCH_SRCS = $(addsuffix .cc,$(addprefix dispatch,$(shell seq 0 $(NDISPATCH))))
 
 $(DISPATCH_SRCS): %.cc: dispatch $(wildcard insns/*.h) opcodes.h
 	$< $(subst dispatch,,$(subst .cc,,$@)) $(NDISPATCH) 1024 < $(src_dir)/riscv/opcodes.h > $@