elflint: Don't check shdr or TLS symbol offsets against debuginfo phdrs.

In debuginfo files the phdrs file offsets match those of the original ELF
file. So the section header file offsets and the TLS symbol value offset
in debuginfo files cannot be sanity checked against the phdrs file offset.

The issue can be triggered with run-strip-strmerge.sh test when configured
with --enable-gcov. Which will insert a .tbss section and TLS symbols that
trigger the above checks.

Signed-off-by: Mark Wielaard <mjw@redhat.com>