[jbuild] avoid paths mentioning "." needlessly

Summary:
Seeing rrors in "/foo/bar/src/base/infer.ml" is less distracting than seeing
errors in "/foo/bar/src/./base/infer.ml".

Reviewed By: jberdine

Differential Revision: D5621060

fbshipit-source-id: 55ee069

infer/src/jbuild.in

@@ -20,15 +20,13 @@ let ( ^/ ) = Filename.concat
 
 let sources =
   let src_dirs =
-    let src_dir = "." in
     (* if you update the list of source directories, do not forget to also update .merlin *)
-    src_dir
+    "."
     :: ( if facebook then
            (* do not use the symlinks in src/facebook/: jbuilder will not detect that the files have changed if they are hidden behind a symlink *)
            "../../facebook/skel/infer/src/facebook"
-       else src_dir ^/ "opensource" )
-       :: List.map (Filename.concat src_dir)
-            ( ( if clang then ["clang"; "clang_plugin"; ("unit" ^/ "clang")]
+       else "opensource" )
+       :: ( ( if clang then ["clang"; "clang_plugin"; ("unit" ^/ "clang")]
             else ["clang_stubs"; ("unit" ^/ "clang_stubs")] )
           @ [ (if java then "java" else "java_stubs")
             ; "absint"