Work around problem in DWARF decoding library which can result in attempts to read...

Work around problem in DWARF decoding library which can result in attempts to read arbitrary bytes as if they were an LEB128 encoded value.

	* dwarf.c (skip_attr_bytes): Accept DWARF versions higher than 4
	when processing the DW_FORM_ref_addr form.
	Skip bytes in DW_FORM_block and DW_FORM_exprloc forms.
	Handle DW_FORM_indirect.
	(get_type_signedness): Allow a limited amount of recursion.
	Do not attempt to decode types that use the DW_FORM_ref_addr form.
	(read_and_display_attr_value): 	Do not attempt to decode types
	that use the DW_FORM_ref_addr form.