Build NSS/application-services with LTO to avoid unnecessary networking symbols

From application-services#1. The libraries built in application-services currently have libc networking symbols, which are optimized out when building/linking NSS with the right LTO config. We could build with those optimizations, and also possibly add a check to ensure the final libraries are free from such libc symbols.

Edited Sep 15, 2020 by Alex Catarineu

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