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executable introspection: only enable checks on Linux

Antoine Jacoutot requested to merge ajacoutot/gnome-shell:nonlinux-exe-introspection into main

elf.h and link.h do not provide ElfW types on BSD systems, triggering the following error (and more) while compiling gnome-shell:

../gnome-shell-44.0/src/main.c:135:3: warning: implicit declaration of function 'ElfW' is invalid in C99 [-Wimplicit-function-declaration] ElfW (Dyn) *dyn; ^ ../gnome-shell-44.0/src/main.c:135:9: error: use of undeclared identifier 'Dyn' ElfW (Dyn) *dyn;

So let's keep the check for Linux systems only (both glibc and musl seems to define ElfW.

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