Solver: Enforce dependencies on executables (fixes #4781).
This commit adds two checks to the validation phase of the solver: 1. It checks that each newly chosen package instance contains all executables that are required from that package so far. 2. It checks that each new build tool dependency that refers to a previously chosen package can be satisfied by the executables in that package. This commit also fixes a TODO related to solver log messages. Previously, it was possible for the log to associate an incorrect executable name with a dependency.
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