supporting glibc < 2.12

our customers have the requirements to use fesql with glibc < 2.12

The issue mentions supporting glibc versions older than 2.12 for OpenMLDB, but does not specify what changes are needed. Research the project's build system and dependencies to identify glibc usage. Check for any compile-time or runtime compatibility issues. Look at existing CI configurations or documentation for glibc requirements. Determine what 'supporting' entails: compilation, linking, or runtime behavior.

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