[cmake-developers] [PATCH] fix version handling in find_dependency macro

[Alex Merry]

The handling of the optional version argument in the find_dependency()
macro is just wrong.  It is only set if ${ARGV1} (rather than ARGV1)
evaluates to true, and otherwise it remains unchanged from whatever its
previous value was (instead of being cleared).

Either of the attached patches fixes this.

Alex
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