[BUG] compile eBPF_proc_image error

[piaoxuebingfeng]

Describe the bug
compile eBPF_proc_image error.

To Reproduce
Steps to reproduce the behavior:

cd lmp/eBPF_Supermarket/CPU_Subsystem/eBPF_proc_image/
make
BPF .output/schedule_image.bpf.o
GEN-SKEL schedule_image
CC .output/controller.o
CC .output/hashmap.o
CC .output/trace_helpers.o
CC .output/uprobe_helpers.o
BINARY controller
CC .output/proc_image.o
BINARY proc_image
.output/proc_image.o: In function main': /lmp/eBPF_Supermarket/CPU_Subsystem/eBPF_proc_image/proc_image.c:972: undefined reference to pthread_join'
/lmp/eBPF_Supermarket/CPU_Subsystem/eBPF_proc_image/proc_image.c:980: undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
make: *** [Makefile:145: proc_image] Error 1

Expected behavior
compile eBPF_proc_image success.
Screenshots
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Desktop (please complete the following information):

• OS: Centos8

Additional context
Add any other context about the problem here.

[zhangzihengya]

可以在Makefile里引一下你系统的pthread.h库