Import patches from mainline to fix minor binutils bugs:

Import patches from mainline to fix minor binutils bugs:

	PR 21861
	* winduni.c (codepages): Use cp1252 for codepage 0.

	PR 21813
	* rddbg.c (read_symbol_stabs_debugging_info): Check for an empty
	string whilst concatenating symbol names.

	PR 21909
	* prdbg.c (pr_int_type): Increase size of local string buffer.
	(pr_float_type): Likewise.
	(pr_bool_type): Likewise.

	PR 21820
	* readelf.c (dump_section_as_strings): Do not fail if the section
	was empty.
	(dump_section_as_bytes): Likewise.

	PR 21990
	* readelf.c (process_version_sections <SHT_GNU_verneed>): Check
	for invalid vn_next field before adding to idx.  Use unsigned
	long for index vars.  Move index checks.
	<SHT_GNU_verdef>: Likewise for vd_next.

	PR 21994
	* readelf.c (process_version_sections <SHT_GNU_verdef>): Check
	vd_aux and vda_next for sanity.  Delete "end".  Correct overflow
	checks.
	(process_version_sections <SHT_GNU_verneed>): Correct overflow
	check.  Don't report invalid vna_next on overflow.  Do report
	invalid vna_next on size less than aux info.