[bug#60808] [PATCH 2/2] tests: reuse am_cv_filesystem_timestamp_resolution

[Karl Berry]

    -case $build in
    -  *-pc-msdosdjgpp) MODIFICATION_DELAY=5;;
    -  *)               MODIFICATION_DELAY=2;;
    -esac
    +MODIFICATION_DELAY=$am_cv_filesystem_timestamp_resolution

Looks fantastic to me :). --thanks, karl.