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Optimize header dependencies; improve Makefile dependency graph

Placeholder Jordan Lewis requested to merge github/fork/jordanlewis/betterheaders into master

This patch set includes the following changes:

  • Remove unused #includes
  • Factor out #includes that are only needed in some source files from headers.h
  • Add dependency tracking to unix, mac, and mingw makefiles via gcc's -MMD flag

These changes improve bitcoin's development environment. Previously changing any header file caused a global recompile. With these changes, only those files that directly depend on a changed header file will require recompilation.

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