Update files to match FreeBSD layout

Add compatibility with Newlib header files.  Some FreeBSD header files
are mapped by the translation script:

     o rtems/bsd/sys/_types.h
     o rtems/bsd/sys/errno.h
     o rtems/bsd/sys/lock.h
     o rtems/bsd/sys/param.h
     o rtems/bsd/sys/resource.h
     o rtems/bsd/sys/time.h
     o rtems/bsd/sys/timespec.h
     o rtems/bsd/sys/types.h
     o rtems/bsd/sys/unistd.h

It is now possible to include <sys/socket.h> directly for example.

Generate one Makefile which builds everything including tests.

freebsd/sys/netinet/sctp_cc_functions.h

@@ -27,7 +27,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
-#include <freebsd/sys/cdefs.h>
+#include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
 #ifndef __sctp_cc_functions_h__