Added elf hashing tool and support class

	* include/elfhash.h: Define hashedelf.
	* mageec/elfhash.cpp: Define hashedelf class implementation.
	* mageec/mageechash.cpp: Added command line interface to hashedelf.
	* mageec/Makefile.am: Build mageechash, add elfhash to libmageec.
	* mageec/Makefile.in: Regenerated.
	* Makefile.am: Include elfhash.h with distribution.
	* Makefile.in: Regenerated.
	* configure.ac: Add test for libelf and libgcrypt.
	* configure: Regenerated.