should not include pthread.h

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@131 42af7a65-404d-4744-a932-0658087f49c3

examples/ostest/posixtimer.c

@@ -36,7 +36,6 @@
 #include <sys/types.h>
 #include <stdio.h>
 #include <unistd.h>
-#include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
 #include <sched.h>

examples/ostest/sighand.c

@@ -36,7 +36,6 @@
 #include <sys/types.h>
 #include <stdio.h>
 #include <unistd.h>
-#include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
 #include <sched.h>