makefile: rename target all_check_var -> test_var

Makefile

@@ -145,13 +145,13 @@ $(FONTDIR)/const-hinted/%.ttf: $(FONTDIR)/const/%.ttf
 
 
 # check var
-all_check_var: $(FONTDIR)/var/Inter.var.ttf
-	misc/fontbuild checkfont $(FONTDIR)/var/*.*
+test_var: all_var
+	misc/fontbuild checkfont $(FONTDIR)/var/*.ttf $(FONTDIR)/var/*.woff2
 
 # test runs all tests
 # Note: all_check_const is generated by init.sh and runs "fontbuild checkfont"
 # on all otf and ttf files.
-test: all_check_const  all_check_var
+test: all_check_const  test_var
 	@echo "test: all ok"
 
 # check does the same thing as test, but without any dependency checks, meaning