test/common.sh.in: Clarify it's the first failure by a *named* test.

[nmh] / docs / historical / mh-6.8.5 / conf / examples / system5

# system5       - template
bin     /usr/local
bboards on
etc     /usr/local/lib/mh
mail    mailbox
manuals gen
mts     mh
options SYS5 TYPESIG=void