dependencies: Make Dependency initializer signatures match

Currently PkgConfig takes language as a keyword parameter in position 3,
while the others take it as positional in position 2. Because most
dependencies don't actually set a language (they use C style linking),
using a positional argument makes more sense. ExtraFrameworkDependencies
is even more different, and duplicates some arguments from the base
ExternalDependency class.

For later changes I'm planning to make having all of the dependencies
use the same signature is really, really helpful.

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