libatomic: Fix build for --disable-gnu-indirect-function [PR113986]

libatomic: Fix build for --disable-gnu-indirect-function [PR113986]

Fix libatomic build to support --disable-gnu-indirect-function on AArch64.
Always build atomic_16.S, add aliases to the __atomic_ functions if !HAVE_IFUNC.
Include auto-config.h in atomic_16.S to avoid having to pass defines via
makefiles.  Fix build if HWCAP_ATOMICS/CPUID are not defined.

libatomic:
	PR target/113986
	* Makefile.in: Regenerated.
	* Makefile.am: Make atomic_16.S not depend on HAVE_IFUNC.
	Remove predefine of HAVE_FEAT_LSE128.
	* acinclude.m4: Remove ARCH_AARCH64_HAVE_LSE128.
	* configure: Regenerated.
	* config/linux/aarch64/atomic_16.S: Add __atomic_ alias if !HAVE_IFUNC.
	* config/linux/aarch64/host-config.h: Correctly handle !HAVE_IFUNC.
	Add defines for HWCAP_ATOMICS and HWCAP_CPUID.