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This cleans up a bit how we set up things for the ELF section magic:
1. Let's always use our gcc macros, instead of __attribute__ directly
2. Align our structures to sizeof(void*), i.e. the pointer size, rather
than a fixed 8 or __BIGGEST_ALIGNMENT__. The former is unnecessarily
high for 32bit systems, the latter too high for 64bit systems. gcc
seems to use ptr alignment for static variables itself, hence this
should be good enough for us too. Moreover, the Linux kernel also
uses pointer alginment for all its ELF section registration magic,
hence this should be good enough for us too.
3. Let's always prefix the sections we create ourself with SYSTEMD_,
just to make clear where they come from.
4. Always align the pointer we start from when iterating through these
lists. This should be unnecessary, but makes things nicely
systematic, as we'll align all pointers we use to access these
sections properly.
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