Always use align_size as pr_datasz for GNU_PROPERTY_STACK_SIZE

Always use align_size as pr_datasz for GNU_PROPERTY_STACK_SIZE

For GNU_PROPERTY_STACK_SIZE, pr_datasz is the same as align_size, which
is 8 bytes for 64-bit ELF binaries and 4 bytes for 32-bit ELF binaries,
Use align_size as pr_datasz for GNU_PROPERTY_STACK_SIZE to convert
.note.gnu.property section.

bfd/

	PR binutils/23494
	* elf-properties.c (elf_get_gnu_property_section_size): Always
	use align_size as pr_datasz for GNU_PROPERTY_STACK_SIZE.
	(elf_write_gnu_properties): Likewise.

binutils/

	PR binutils/23494
	* testsuite/binutils-all/x86-64/pr23494c.s: New file.
	* testsuite/binutils-all/x86-64/pr23494e-x32.d: Likewise.
	* testsuite/binutils-all/x86-64/pr23494e.d: Likewise.