This introduces crtbegin_so.o and crtend_so.o and also requires a corresponding
change in the NDK build scripts to use them.
Also add a small test under 'tests/dlclose-destruction' to check that.
Note that this is not a sample (i.e. Android application) per se.
Change-Id: Icf25836363a3ed59310e579ce990aeca868e70e4
The idea is to allow developing the NDK in the open, while
having the platforms and samples under a private branch until
the corresponding release are open-sourced.
Change-Id: Iee995fb6c4d3ee1387dea7486e599e079c9e4c6d