bionic: linker: fix prelink support

load_bias_ needs to be calculated from the min_vaddr, not the
prelink address

Fixes

couldn't map "libraryname.so" segment 1: Invalid argument

Change-Id: Ibf1fd1d5a0f2c81ce515f5d47412a043ba768247
bionic: call stdio cleanup on exit

As of 61e699a133a4807fe878a6cb0d7190d7c96e21f8, stdio clean up
functions are no longer registered in atexit and must be called
manually via __cleanup.

The issue this fixes is some static binaries linked against bionic
cannot output properly when piped or redirected because the buffer
is not flushed before closing.

This is done by pulling in exit.c (and other dependencies) from
netbsd.

Change-Id: I193e54a6d08900f291550029fe75ce76394d9e22