title: Qt Creator fails to build Android library due to back slashes in NDK path
body: <p>I am trying to build by C++ library for Android on Windows 8.1 using NDK android-ndk-r10e. The library builds totally fine on Linux, but I can't get it working on Windows.</p>
  
  <p>I am always getting this error:</p>
  
  <pre><code>/usr/bin/sh: C:android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-g++: No such file or directory
  </code></pre>
  
  <p>As you can see, Qt Creator displays path to g++ as <code>C:android-ndk-r10e</code> while it is actually <code>C:\android-ndk-r10e</code>. I tried to manually edit Makefile, but it seems to re-create it every time, so my changes got discarded.</p>
  
  <p>I this a known issue? How can I work around it?</p>
  
  <p>(Qt version 5.4.2, Qt Creator 3.6.0)</p>