Compile dependencies.

By default, compile all dependencies. A list of dependencies can be given to force the compilation of specific dependencies.

This task attempts to detect if the project contains one of the following files and act accordingly:

• mix.exs - invokes mix compile
• rebar.config - invokes rebar compile
• Makefile.win - invokes nmake /F Makefile.win (only on Windows)
• Makefile - invokes make (except on Windows)

The compilation can be customized by passing a compile option in the dependency:

{:some_dependency, "0.1.0", compile: "command to compile"}