Add parameter add_p_vaddr to dwfl_report_elf.

Add parameter add_p_vaddr to dwfl_report_elf.

libdwfl/
	* dwfl_report_elf.c (__libdwfl_report_elf): Add parameter add_p_vaddr.
	Set it to true for ET_EXEC and ET_CORE.  Provide alternative
	setup of START and BIAS if !ADD_P_VADDR.  Set END from BIAS, not BASE.
	(dwfl_report_elf): Add parameter add_p_vaddr.  Pass it down.  Add
	NEW_VERSION.
	(_compat_without_add_p_vaddr_dwfl_report_elf) <SHARED>: New, with
	COMPAT_VERSION.
	* libdwfl.h (dwfl_report_elf): Add parameter add_p_vaddr.  Describe it.
	* libdwflP.h (__libdwfl_report_elf): Add parameter add_p_vaddr.
	* link_map.c (report_r_debug): Use true add_p_vaddr for dwfl_report_elf.
	* linux-kernel-modules.c (report_kernel): Use false add_p_vaddr for
	dwfl_report_elf.
	* offline.c (process_elf): Use true add_p_vaddr for dwfl_report_elf.

tests/
	* dwfl-report-elf-align.c: Use false add_p_vaddr for dwfl_report_elf.

Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>