autoconf: 2 testsuite failures on CentOS Stream 8

[Luke Mewburn]

Hi,

While preparing some bug fixes for autoconf, I ran the testsuite
from a clean git clone (branch master as at commit 8e7281d7)
on CentOS Stream 8, and there were two failures:

## GNU Autoconf 2.72c.24-8e728 test suite. ##                           
## --------------------------------------- ##

 11: autoconf: forbidden tokens, basic               FAILED (tools.at:485)
 41: autom4te preselections                          FAILED (tools.at:1545)


Are these known issues on RHEL 8 / CentOS / Fedora style systems?
Is it worth sending more details to bug-autoconf@ including testsuite.log
per the end of the testsuite output, or is that just spamming the bug tracker?

regards,
Luke.