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/include/arpa/inet.h

@@ -65,7 +65,7 @@
 /* External definitions for functions in inet(3). */
 
 #include <sys/cdefs.h>
-#include <sys/_types.h>
+#include <rtems/bsd/sys/_types.h>
 
 /* Required for byteorder(3) functions. */
 #include <machine/endian.h>

freebsd/include/arpa/nameser.h

@@ -60,8 +60,8 @@
 
 #define BIND_4_COMPAT
 
-#include <sys/param.h>
-#include <sys/types.h>
+#include <rtems/bsd/sys/param.h>
+#include <rtems/bsd/sys/types.h>
 #include <sys/cdefs.h>
 
 /*%

freebsd/include/arpa/nameser_compat.h

@@ -41,7 +41,7 @@
 
 #define	__BIND		19950621	/*%< (DEAD) interface version stamp. */
 
-#include <freebsd/machine/endian.h>
+#include <machine/endian.h>
 
 #if !defined(_BYTE_ORDER) || \
     (_BYTE_ORDER != _BIG_ENDIAN && _BYTE_ORDER != _LITTLE_ENDIAN && \