Revert "Detect ld.so and libc.so version inconsistency during startup"

Revert "Detect ld.so and libc.so version inconsistency during startup"

This reverts commit 6f85dbf102ad7982409ba0fe96886caeb6389fef.

Once this change hits the release branches, it will require relinking
of all statically linked applications before static dlopen works
again, for the majority of updates on release branches: The NEWS file
is regularly updated with bug references, so the __libc_early_init
suffix changes, and static dlopen cannot find the function anymore.

While this ABI check is still technically correct (we do require
rebuilding & relinking after glibc updates to keep static dlopen
working), it is too drastic for stable release branches.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>