Update .gitignore

Change-Id: I76598cb827c97ed80561d78680db0bf13e75f5ca
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>

.gitignore

@@ -111,7 +111,8 @@ qtc-debugging-helper
 # linux shared libraries
 *.so*
 
-# windows shared libraries
+# windows binaries
+*.exe
 *.dll
 
 # osx shared libraries