* configure.in: Check for unistd.h.

* configure: Regenerated.

* command.c, cp-valprint.c, fork-child.c, i386-tdep.c,
i386b-nat.c, inflow.c, main.c, maint.c, objfiles.c, solib.c,
source.c, stack.c, symfile.c, top.c, utils.c: Include strings.h
and/or unistd.h to bring prototypes into scope.

gdb/cp-valprint.c

@@ -28,6 +28,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include "gdbcmd.h"
 #include "demangle.h"
 #include "annotate.h"
+#include <string.h>
 
 int vtblprint;			/* Controls printing of vtbl's */
 int objectprint;		/* Controls looking up an object's derived type