Add makeful rules to .editorconfig

OMFG, why is it not set to tabs??

.editorconfig

@@ -19,9 +19,11 @@ indent_size = 4
 # Make these match what we have in .gitattributes
 [*.mk]
 end_of_line = lf
+indent_style = tab
 
 [Makefile]
 end_of_line = lf
+indent_style = tab
 
 [*.sh]
 end_of_line = lf