Make sure that the same tests are on all platforms.

In order to be able to generate a list of tests for cts, the same set of
tests must exist across all platforms. This CL adds empty tests where a
test was conditionally compiled out.

This CL creates a single library libBionicTests that includes all of
the tests found in bionic-unit-tests-static.

Also fix a few missing include files in some test files.

Tested by running and compiling the tests for every platform and
verifying the same number of tests are on each platform.

Change-Id: I9989d4bfebb0f9c409a0ce7e87169299eac605a2

Conflicts:
	tests/Android.mk
	tests/fortify_test.cpp
	tests/libc_logging_test.cpp
	tests/pthread_test.cpp
	tests/stdio_test.cpp
	tests/sys_epoll_test.cpp
	tests/sys_select_test.cpp
	tests/sys_sendfile_test.cpp
	tests/system_properties_test.cpp
	tests/time_test.cpp