[manylinux2010] glibc update & glibc cache/image size reduction #874
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Update glibc from 2.12-1.212.el6 to 2.12-1.212.el6_10.3
Latest (and last) update to get security fixes for the rebuilt glibc
Reduce glibc rebuild cache size
2.5GB -> 1GB, should save resources on both local builds and travis-ci builds
Reduce image size
Final image is now built from scratch because almost everything gets replaced in the base centos:6 image which means it's useless to pull this base image as it will not help with caching but just increase storage/bandwidth requirements when the host does not use centos:6 base image for other images => 384 MB (including centos:6, 194MB) -> 200MB