libdwfl: switch to DEBUGINFOD_SONAME, remove libdebuginfod.so fallback

Since DEBUGINFOD_SONAME is as good as ("libdebuginfod-" VERSION ".so")
for dlopen, switch to use the name which is a part of the API.

Given that DEBUGINFOD_SONAME is always available now, remove the no longer
needed fall back to dlopen of "libdebuginfod.so".

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
2 files changed