sbt.ExtractDependencies: avoid false dependencies

Type#member might return a denotation that doesn't "really exists" (as
defined by TypeAssigner#reallyExists), in some circumstance this
denotation can refer to a symbol in a class that is in the classpath but
that is not used by this file, so using addDependency on the result of
Type#member might add a false dependency. We avoid this by using
Type#select instead which will internally do the right thing.

This issue was discovered while compiling the bootstrapped projects
which would sometimes force a full recompilation for no reason.

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