build: replace m4 defines with sed scripts during build

There is no reason anymore to use m4 since we got rid of the includes by
using library files. Let's replace the last usage of m4 and completely
red rid of it.

Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

Makefile

@@ -68,7 +68,9 @@ ifneq ($(wildcard setarch-aliases.d/*),)
 endif
 
 
-edit = sed -e "s|@pkgdatadir[@]|$(DATADIR)|g"
+edit = sed \
+	-e "s|@pkgdatadir[@]|$(DATADIR)|g" \
+	-e "s|@buildtoolver[@]|$(BUILDTOOLVER)|g"
 GEN_MSG = @echo "GEN $(patsubst $(BUILDDIR)/%,%,$@)"
 
 define buildInScript
@@ -76,7 +78,7 @@ $(1)/%: $(2)%$(3)
 	$$(GEN_MSG)
 	@mkdir -p $$(dir $$@)
 	@$(RM) "$$@"
-	@{ echo -n 'm4_changequote([[[,]]])'; cat $$<; } | m4 -P --define=m4_devtools_version=$$(BUILDTOOLVER) | $(edit) >$$@
+	@cat $$< | $(edit) >$$@
 	@chmod $(4) "$$@"
 	@bash -O extglob -n "$$@"
 endef

src/lib/common.sh

@@ -17,7 +17,7 @@ export LANG=C
 
 # Set buildtool properties
 export BUILDTOOL=devtools
-export BUILDTOOLVER=m4_devtools_version
+export BUILDTOOLVER=@buildtoolver@
 
 # Set common properties
 export PACMAN_KEYRING_DIR=/etc/pacman.d/gnupg