deprecate clear
Merge pull request #415 from dawgfoto/DeprecateDestroy

deprecate clear
Merge pull request #406 from dawgfoto/GNULinuxLinkHeader

GNU/linux <link.h> header
druntime implementation for the new ELF registration

- Store information from self-registering libraries. The compiler
  provides ModuleInfos and EH tables.
reference _d_dso_registry for weak-linkage

- because we're linking against archives the linker
  would never read the rt/dso.o object file