elfutils: update to 0.187

elfutils: update to 0.187

Changes:
debuginfod: Support -C option for connection thread pooling.

debuginfod-client: Negative cache file are now zero sized instead of
                   no-permission files.

addr2line: The -A, --absolute option, which shows file names including
           the full compilation directory is now the default.  To get the
           old behavior use the new option --relative.

readelf, elflint: Recognize FDO Packaging Metadata ELF notes

libdw, debuginfo-client: Load libcurl lazily only when files need to
                         be fetched remotely. libcurl is now never
                         loaded when DEBUGINFOD_URLS is unset. And when
                         DEBUGINFOD_URLS is set, libcurl is only loaded
                         when the debuginfod_begin function is called.

Signed-off-by: Nick Hainke <vincent@systemli.org>