pmm-agent is broken on CentOS 6

STR:

1. Install latest pmm2-client on CentOS 6
2. Check version of pmm-agent
   Given result:

    [nailya.kutlubaeva@bm-qanqa05 ~]$ pmm-agent --version
   pmm-agent: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by pmm-agent)

Expected result: Version of pmm-agent is returned
BTW:

 [nailya.kutlubaeva@bm-qanqa05 ~]$ pmm-admin --version
ProjectName: pmm-admin
Version: 2.0.0-beta6
PMMVersion: 2.0.0-beta6
Timestamp: 2019-08-13 09:00:46 (UTC)