Let eshell/sudo handle absolute command names (Bug#27167)

* lisp/eshell/esh-ext.el (eshell-find-interpreter): Don't change
absolute paths into relative ones.

lisp/eshell/esh-ext.el

@@ -299,11 +299,13 @@ line of the form #!<interp>."
       (let ((fullname (if (file-name-directory file) file
 			(eshell-search-path file)))
 	    (suffixes eshell-binary-suffixes))
-	(if (and fullname
-		 (not (file-remote-p fullname))
-		 (file-remote-p default-directory))
-	    (setq fullname (expand-file-name
-			    (concat "./" fullname) default-directory)))
+	(when (and fullname
+                   (not (file-remote-p fullname))
+                   (file-remote-p default-directory))
+          (setq fullname
+                (if (file-name-absolute-p fullname)
+                    (concat (file-remote-p default-directory) fullname)
+                  (expand-file-name fullname default-directory))))
 	(if (and fullname (not (or eshell-force-execution
 				   (file-executable-p fullname))))
 	    (while suffixes