[fix] remove the executable permission of thread.c (#6001)
[fix] remove the executable permission of thread.c (#6001)

Signed-off-by: Jianhui Zhao <599fd8ddd75bf8ddbbb6b856972751b9a247af66@gmail.com>
RT-Thread/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread