Test error cases in find_dependency.
find_dependency: Make sure invalid EXACT use can be reported.

Test the first argument directly for matching 'EXACT'. The error
check in its previous position was incorrect and would only trigger
with a version of '0' or similar.
Merge topic 'fix-find_dependency-EXACT' into next

224f50f4 find_dependency: Make sure invalid EXACT use can be reported.
Merge topic 'fix-find_dependency-EXACT-for-master' into next

f74a8405 Test error cases in find_dependency.