croaring:fix build

[xingyaner]

Upgrade the Make build to CMake

[github-actions]

xingyaner is a new contributor to projects/croaring. The PR must be approved by known contributors before it can be merged. The past contributors are: maflcko, nathaniel-brough, lemire, K2

[DavidKorczynski]

am not sure about this PR as not it has 0 changes done.

The first one introduced a build.sh which is not how the upstream project does it.

Please coordinate with maintainers for these PRs.

[xingyaner]

Thank you for the feedback. I'll coordinate with the upstream maintainers regarding these changes. From my analysis, the CRoaring configuration currently has two key issues for OSS-Fuzz integration:
1、Insufficient Sanitizer Flags: The default sanitizer configuration lacks several flags required by OSS-Fuzz, such as -fsanitize=fuzzer-no-link and -Wno-error=....
2、Incorrect Compiler Selection: The CMake build system directly calls the system compiler instead of respecting the $CC environment variable provided by OSS-Fuzz, which points to a dedicated compiler wrapper.