Failure in packager script due to missing command 'arch'

[jmanno1]

Commit packager: fetch glibc corresponding to the architecture causes unintended failure on certain operating systems.

This commit introduces the use of the 'arch' command. The 'arch' command is not default installed in GNU coreutils. See here: https://www.gnu.org/software/coreutils/manual/html_node/arch-invocation.html

Perhaps we switch to using uname -m ?