mysqld from mariadb-10.4.6-linux-systemd-x86_64.tar.gz requires newer version of libstdc++ than one available for RHEL7

1. ./mariadb-10.4.6-linux-systemd-x86_64/bin/mysqld --help
   ./mariadb-10.4.6-linux-systemd-x86_64/bin/mysqld: /lib64/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by ./mariadb-10.4.6-linux-systemd-x86_64/bin/mysqld)
   ./mariadb-10.4.6-linux-systemd-x86_64/bin/mysqld: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by ./mariadb-10.4.6-linux-systemd-x86_64/bin/mysqld)
   ./mariadb-10.4.6-linux-systemd-x86_64/bin/mysqld: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by ./mariadb-10.4.6-linux-systemd-x86_64/bin/mysqld)

1. strings /lib64/libstdc++.so.6 | grep CXX
   GLIBCXX_3.4
   GLIBCXX_3.4.1
   GLIBCXX_3.4.2
   GLIBCXX_3.4.3
   GLIBCXX_3.4.4
   GLIBCXX_3.4.5
   GLIBCXX_3.4.6
   GLIBCXX_3.4.7
   GLIBCXX_3.4.8
   GLIBCXX_3.4.9
   GLIBCXX_3.4.10
   GLIBCXX_3.4.11
   GLIBCXX_3.4.12
   GLIBCXX_3.4.13
   GLIBCXX_3.4.14
   GLIBCXX_3.4.15
   GLIBCXX_3.4.16
   GLIBCXX_3.4.17
   GLIBCXX_3.4.18
   GLIBCXX_3.4.19
   CXXABI_1.3
   CXXABI_1.3.1
   CXXABI_1.3.2
   CXXABI_1.3.3
   CXXABI_1.3.4
   CXXABI_1.3.5
   CXXABI_1.3.6
   CXXABI_1.3.7
   CXXABI_TM_1
   GLIBCXX_DEBUG_MESSAGE_LENGTH