Replace common targets with Makefile-specific ones

This is in preparation for including all subdirectory Makefiles in a top-level
Makefile. This will avoid multiply-defined targets with recipes when the
Makefiles are included together. This maintains compatibility with the
existing recursive make structure by replacing the original targets with
recipe-free targets that only depend on the Makefile-local targets.

This was automatically applied by UpdateTargetNames() in:
https://code.google.com/p/mike-bland/source/browse/openssl/update_makefiles.py