this change brokes 3rd party packages (like activestate-tcl) that parsing /lib*/libc-x.y.so result.
testcase:
$ echo 'package require platform; set p [platform::identify]; puts $p' | tclsh
linux-glibc6.-x86_64
^^^ should be linux-glibc2.17-x86_64
do we really need this breaking change?