runtest: More helpful error when top of wine directory isn't found.

[Dylan Smith]

When the top of the wine directory isn't found with runtest, it will
output the following:

exec: 127: /wine: not found

This isn't very helpful, so instead the else case should be caught when
trying to autodetect the top of the wine tree.
---
 tools/runtest |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
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