Handle odd return codes for waccess(..) in src/path.cpp under Solaris

src/path.cpp

@@ -80,12 +80,21 @@ static bool path_get_path_core(const wcstring &cmd, wcstring *out_path,
             err = EACCES;
         } else {
             switch (errno) {
-                case ENOENT:
-                case ENAMETOOLONG:
                 case EACCES:
+                case ENAMETOOLONG:
+                case ENOENT:
                 case ENOTDIR: {
                     break;
                 }
+#ifdef __sun
+                //Solaris 5.11 can return any of the following three if the path
+                //does not exist. Yes, even 0. No, none of this is documented.
+                case 0:
+                case EAGAIN:
+                case EEXIST: {
+                    break;
+                }
+#endif
                 //WSL has a bug where access(2) can return EINVAL
                 //See https://github.com/Microsoft/BashOnWindows/issues/2522
                 //The only other way EINVAL can happen is if the wrong