runtest: Fixed regression that prevented using just the -h option.

[Dylan Smith]

The problem can be seen by going to a dlls tests directory then run:
../../../tools/runtest -h

The output will be the following:
Fatal: test '-h' does not exist.

The regression was caused by a change to one of my patches when it was
committed:
 commit 443bfc99ade555995d503e7fd72ab86318acb986
 runtest: Let the test program handle the lack of a test name.

The problem is that the last parameter is assumed to contain the test
name if a parameter is given.  I fixed this by going back to using the
infile variable that was used before.

I also added a shift for the -- end of options case, because it
shouldn't be included with the positional arguments, otherwise it would
be interpreted as a test name if the infile variable hasn't been set.
---
 tools/runtest |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)
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