posix接口融合，接口规范兼容性修改

BREAKING CHANGE:
接口修改：
calloc
pthread_mutex_init
mq_unlink
pthread_join
pthread_exit
pthread_attr_init
pthread_attr_destroy
pthread_condattr_destroy
pthread_cond_timedwait
pthread_mutexattr_init
pthread_mutexattr_settype
pthread_mutex_destroy
pthread_mutex_timedlock
pthread_mutex_trylockk
pthread_mutex_unlock
sem_getvalue

新增接口：
CheckForCancel
pthread_setcancelstate
pthread_setcanceltype
pthread_once
pthread_setschedprio
pthread_attr_setstack
pthread_attr_getstack
pthread_condattr_getpshared
pthread_condattr_setpshared
pthread_condattr_getclock
pthread_mutexattr_gettype
CheckMutexAttr
OsMuxPreCheck
sem_trywait

接口变化：
mq_getsetattr 改为内部接口OsMqGetSetAttr

接口位置转移：
pthread_equal接口由newlib下转移到kal/posix/src/pthread.c中
Signed-off-by: NLiteOS2021 <dinglu@huawei.com>