Update build.sh

[colommar]

去掉默认自动检测当前机器上CPU的个数来决定编译并发数量，改由自己决策。

What problem were solved in this pull request?

Issue Number: #303

Problem:收到多名同学反馈编译执行buidl.sh卡死。build.sh中会自动检测当前机器上CPU的个数来决定编译并发数量，但是很多同学的机器内存与CPU并不匹配，会导致编译卡死。

What is changed and how it works?

将此处改成MAKE_ARGS=()

https://github.com/oceanbase/miniob/blob/f42235649b7d3860aaecc08265bb801b12dd7ef3/build.sh#L12

• 去掉并发编译，使用者各取所需，在执行build.sh时直接使用 -jN 参数自行选择并行度。

  Other information

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 36.99%. Comparing base (f422356) to head (57412f6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #343 +/- ## ======================================= Coverage 36.99% 36.99% ======================================= Files 101 101 Lines 7272 7272 ======================================= Hits 2690 2690 Misses 4582 4582 ```

:umbrella: View full report in Codecov by Sentry.
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[hnwyllmm]

还有不少功能待开发，如果兴趣欢迎一起做

[colommar]

还有不少功能待开发，如果兴趣欢迎一起做

好的，非常感谢。