Update from 7.3.0-15 to 7.3.0-16 based GCC causes lintian problems

Upstream fwupd runs CI with Debian testing and Ubuntu devel. As part of that CI we run lintian after a packaged build.
A few days ago we started noticing failures in Ubuntu first and then Debian later (probably because Ubuntu pulled in the -16 based GCC-7 before it migrated to Debian testing):

E: fwupd: library-not-linked-against-libc usr/lib/x86_64-linux-gnu/fwupd-plugins-3/libfu_plugin_upower.so
E: fwupd-tests: library-not-linked-against-libc usr/lib/x86_64-linux-gnu/fwupd-plugins-3/libfu_plugin_test.so

I examined the files and sure enough they don't have libc.s.6 marked NEEDED.

Compiling with the older compiler (or clang) they do.

Newer:
$ objdump -x build/obj-x86_64-linux-gnu/plugins/test/libfu_plugin_test.so | grep needed -i
  NEEDED libgobject-2.0.so.0
  NEEDED libglib-2.0.so.0

Older:
$ objdump -x build/obj-x86_64-linux-gnu/plugins/test/libfu_plugin_test.so | grep needed -i
  NEEDED libgobject-2.0.so.0
  NEEDED libglib-2.0.so.0
  NEEDED libpthread.so.0
  NEEDED libc.so.6

We were looking at this upstream and find that it only happens if the compiler optimization is set to -O2. (which is our default). Setting it to -O0 the problem goes away.