Split EXEC_DEPENDS into FETCH_DEPENDS, BUILD_DEPENDS and RUN_DEPENDS.

They are called from the fetch, extract and install targets,
respectively.

Also, only RUN_DEPENDS is put into the @pkgdep list of the package.

EXEC_DEPENDS is still supported (for now), it is copied into
BUILD_DEPENDS and RUN_DEPENDS.  This will go away after we finish
fixing all the ports Makefiles.

This change fixes the following bug/features:

(1) "make fetch" building and installing all the dependencies

(2) Programs needed for building only (e.g., gmake) put into the
    packages' dependency lists ("why does the emacs package depend on
    gmake?")

Reviewed by:	the ports list

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