Make sure we pull the right app_process from device.

On arm64 devices /system/bin/app_process is a symlink to /system/bin/
app_process64, the problem is that we are pulling it also for 32bit
apps, which will make the debugging impossible because arm-linux-
androideabi-gdb 32bit can't mix the architectures.

Change-Id: I37e071456fb89051b0433ee2e7635085257616ea
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/plugins/android/androiddeployqtstep.h

@@ -127,6 +127,7 @@ private:
     QString m_buildDirectory;
     QString m_avdName;
     QString m_apkPath;
+    QString m_appProcess;
 
     QString m_targetArch;
     bool m_uninstallPreviousPackage;