winemenubuilder: Try to wait for creating icon files (try 2).

[Sergey Guralnik]

It supersedes next patch:

 From 4ca51cf16c5be2bcf34dddb7f33fe043c1d777c4 Mon Sep 17 00:00:00 2001
 From: Sergey Guralnik <serhio at etersoft.ru>
Date: Tue, 22 Jan 2013 15:58:20 +0200
Subject: winemenubuilder: Use only existing file for icon creating.

The logic is the same as before - wait for parent process termination 
if
required icon file doesn't exist yet. But now used easier way to do 
this.

-- 
Sergey
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