fix(build): surpress spurious warnings from gcc in -E preprocessor mode

Since #29315 we are also preprocessing header files in order to find
functions which need prototype declarations. gcc emits a spurious
"warning: #pragma once in main file" even when when you are just
using `gcc -E` which causes a bit of noise in compiler output.

As a workaround, surpress all warnings for this step, this should be pretty
much harmless as we will still get preprocessor warnings when doing
actual compilation `gcc -c` later.

reference: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89808

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