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'
Add an optional --logfile argument to std::test::test_main and to
compiletest.
Use this features and the new 'check-summary.py' script to
summarise all the tests performed by the 'check' target. This is
a short term fix for #2075.
