bug: can not run APISIX on the ARM platfrom (centos 7)

[moonming]

Issue description

APISIX run error on the ARM platform

Environment

APISIX 0.7 RPM package
huawei cloud kc1.small.1
CentOS 7.6 64bit with ARM

Minimal test code / Steps to reproduce the issue

sudo apisix start

What's the actual result? (include assertion message & call stack if applicable)

[root@ecs-arm ~]# sudo apisix start
nginx: [error] init_by_lua error: error loading module 'rapidjson' from file '/usr/local/apisix//deps/lib64/lua/5.1/rapidjson.so':
/usr/local/apisix//deps/lib64/lua/5.1/rapidjson.so: cannot open shared object file: No such file or directory
stack traceback:
[C]: at 0xffff8ef4c5c0
[C]: in function 'require'
/usr/local/apisix/lua/apisix/core/schema.lua:1: in main chunk
[C]: in function 'require'
/usr/local/apisix/lua/apisix/core/config_etcd.lua:9: in main chunk
[C]: in function 'require'
/usr/local/apisix/lua/apisix/core.lua:4: in main chunk
[C]: in function 'require'
/usr/local/apisix/lua/apisix.lua:4: in main chunk
[C]: in function 'require'
init_by_lua:3: in main chunk

What's the expected result?

[soulsoul]

file miss？

[moonming]

file miss？

# ll /usr/local/apisix//deps/lib64/lua/5.1/rapidjson.so
-rwxr-xr-x 1 root root 2659990 9月   6 17:32 /usr/local/apisix//deps/lib64/lua/5.1/rapidjson.so

the file is exist.

[moonming]

lua-rapidjson built failed by manual in ARM: xpol/lua-rapidjson#44
I think the RPM package can not use directly in ARM server.

[moonming]

rapidjson built failed in ARM: Tencent/rapidjson#1574

[moonming]

APISIX supported ARM64 in ubuntu 18.04, huawei kunpeng CPU: https://mp.weixin.qq.com/s/ZulGGzQRbi23lTvEAbqr6w

[moonming]

we removed rapidjson, so I think APISIX supports ARM64 centos now.