Add a common call when wrapping an app.

When an application is wrapped using setprop wrap.<application>, it
doesn't set the special zygote flag, or make the mallopt call. This
means that a wrapped application will behave differently, and not
be able to track zygote native allocations versus app native allocations.

This CL adds a nativePreApplicationInit call that is used after the
Zygote is forked, and when a wrapped application is called.

Bug: 62068500

Test: Booted sailfish system. Verified that the zygote has not called
Test: the new function. Verified the function is called when a wrapper
Test: is used. Verified the function is called when the Zygote forks
Test: a process.
Change-Id: I392e1b5429be77def63f7815b072d68e9408cc7f
(cherry picked from commit 2980de4a)