abg-dwarf-reader split: create abg-elf-helpers.{h,cc} and test case

abg-elf-helpers.{h,cc} shall contain the ELF related parts of the
abg-dwarf-reader. Create the stub files, an empty unit test and hook
everything up in the make system.

	* src/Makefile.am: Add new source files abg-elf-helpers.{h,cc}.
	* src/abg-elf-helpers.cc: New source file.
	* src/abg-elf-helpers.h: New header file.
	* tests/.gitignore: Exclude runtestelfhelpers from being committed.
	* tests/Makefile.am: Add new test case runtestelfhelpers.
	* tests/test-elf-helpers.cc: New test source file.

Reviewed-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Matthias Maennich <maennich@google.com>
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
6 files changed