tools/elfutils: backport version 0.192 portability patches

tools/elfutils: backport version 0.192 portability patches

These patches will be present in version 0.192 release.

Include them before the update
to support changes before updating
and in order to have a more organized git history.

Manually refreshed patch:
 - 110-objects-manifest.patch

Add patch:
 - 095-src-unused-variable.patch
 - 096-lib-config_h.patch
 - 097-libcpu-config_h.patch
 - 098-libdw-maintainer-clean.patch
 - 099-remove-unlocked-stdio.patch

Tested-by: Georgi Valkov <[email protected]> # macOS
Signed-off-by: Michael Pratt <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16522
Signed-off-by: Robert Marko <[email protected]>