Make check-summary.py support file globbing

Fixes the following error when executing `make check-lite`:

    Traceback (most recent call last):
      File "/home/bnoordhuis/src/rust/src/etc/check-summary.py", line 27, in <module>
        map(summarise, logfiles)
      File "/home/bnoordhuis/src/rust/src/etc/check-summary.py", line 10, in summarise
        with open(fname) as fd:
    IOError: [Errno 2] No such file or directory: 'tmp/*.log'