emit relative dev includes (rescript-lang#82)

Author: anmonteiro

jscomp/bsb/bsb_ninja_gen.ml

@@ -259,7 +259,7 @@ let output_ninja_and_namespace_map
   ;
 
   Buffer.add_char buf '\n';
-  Ext_option.iter  namespace (fun ns ->
+  Ext_option.iter namespace (fun ns ->
       let namespace_dir =
         Ext_path.rel_normalized_absolute_path ~from:root_dir (per_proj_dir // lib_artifacts_dir)
       in

jscomp/bsb/bsb_ninja_rule.ml

@@ -139,7 +139,7 @@ let make_custom_rules
     if read_cmi = `yes then
       Buffer.add_string buf " -bs-read-cmi";
     if is_dev && global_config.g_dev_incls <> [] then begin
-       let dev_incls = Bsb_build_util.include_dirs global_config.g_dev_incls in
+       let dev_incls = rel_incls global_config.g_dev_incls in
         Buffer.add_string buf " ";
         Buffer.add_string buf dev_incls;
     end;