To setup a tool, qtPrepareTool() doesn't fallback anymore (compared to Qt4) to
the build directory (/get paths), but relies instead on QT_TOOL.* variables set
before in the configure stage, which our split configuration doesn't generate.
With this patch, it's back to the previous behavior (which, by the way, has no
effect on anything but Qt builds).
--- ./mkspecs/features/qt_functions.prf.orig	2013-10-22 01:49:28.000000000 -0700
+++ ./mkspecs/features/qt_functions.prf	2013-11-04 07:50:44.835414343 -0800
@@ -193,7 +193,7 @@
 defineTest(qtPrepareTool) {
     cmd = $$eval(QT_TOOL.$${2}.binary)
     isEmpty(cmd) {
-        cmd = $$[QT_HOST_BINS]/$$2
+        cmd = $$[QT_HOST_BINS/get]/$$2
         exists($${cmd}.pl) {
             cmd = perl -w $$system_path($${cmd}.pl)
         } else: contains(QMAKE_HOST.os, Windows) {