We haven't been able to build NativeActivity-based apps (like the
android/qa/sc and anroid/qa/desktop thingies) since we switched to
DISABLE_DYNLOADING and a single DSO liblo-native-code.so anyway.

No lo_main() any more. <sal/main.h> should not be included ever when
compiling for Android of iOS now.

Lots of stuff binned from vcl's androidinst.cxx, in the (vain?) hope
that it will reduce the amount of never invoked GUI code that gets
linked in.

Change-Id: I25f584864c40110774c728a23151e089620442d9