Helps debug crashes, segfaults, etc
as one gets the right backtrace in gdb and dumped core.

Now it runs until a crash caused by ICU library mixup between our ones
and the system ones, they have the same names but aren't
compatible... (see 7ee03666d7cfc27453315e1682e3c32d39a031b6).

But... the names our ICU libraries get built as clash exactly with
Android's system ICU library names, predictably leading to chaos. I
will have to come up with a non-clashing names for our ICU libraries
on Android.

(But isn't it stupid to include an own build of ICU if there is one in
the system already? Sure, but on the other hand the NDK doesn't
include ICU headers or libraries, so clearly Google doesn't consider
it part of the documented API. No guarantee of version stability
etc. Indeed best to avoid them then.)