Eight years old glibcver=2.9 in buildall.sh

[urtabajev]

fluentd-plugin-mdsd/src/buildall.sh

Line 179 in 3d01e94

glibcver=2.9 # max GLIBC version to support

from pull request #11 may be blocking for users when building on Mariner-CBL 2.0.
Consider adding higher version there or removing version check.