add libs/armeabi-v7a to list of dirs deleted before building...
add libs/armeabi-v7a to list of dirs deleted before building...

I had completely forgotten that native libs were being deleted before
building . It is a sensible thing to do but I'm sure others will fall
foul of this one day.

matlink/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,matlink/fdroidserver,matlink/fdroidserver,pfalcon/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,fantastico/fdroidserver,pfalcon/fdroidserver,pfalcon/fdroidserver,OneEducation/AppUniverse_Server,pfalcon/fdroidserver,pfalcon/fdroidserver,fantastico/fdroidserver,fdroidtravis/fdroidserver,fantastico/fdroidserver,OneEducation/AppUniverse_Server,f-droid/fdroidserver,matlink/fdroidserver,fdroidtravis/fdroidserver,fantastico/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,OneEducation/AppUniverse_Server,OneEducation/AppUniverse_Server,OneEducation/AppUniverse_Server,f-droid/fdroid-server,fantastico/fdroidserver,f-droid/fdroidserver,matlink/fdroidserver