fix cortex-m3-emulator start shell failure and fix compile error when using gcc -with-newlib param

APP_Framework/Framework/transform_layer/xizi/user_api/posix_support/include/pthread arm.h

@@ -29,6 +29,7 @@ extern "C" {
 #include <time.h>
 #include <sys/time.h>
 
+#if !defined(_SYS_SCHED_H_) && !defined(_SYS__PTHREADTYPES_H_)
 typedef int   pid_t;
 typedef unsigned long int pthread_t; 
 
@@ -58,7 +59,8 @@ typedef struct pthread_mutexattr {
     int pshared;
 } pthread_mutexattr_t;
 
-typedef int pthread_mutex_t ;
+typedef int pthread_mutex_t;
+#endif
 
 #ifdef __cplusplus
 }