FENNEL:  fix --with-tests option on Windows
FENNEL:  fix --with-tests option on Windows

[git-p4: depot-paths = "//open/dev/": change = 13535]

LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb