osElfTarget should default to False (#5733)
Another portabilty regression: before Platform we used to use elf_OBJ_FORMAT: #if linux_TARGET_OS || freebsd_TARGET_OS || openbsd_TARGET_OS || solaris2_TARGET_OS #define elf_OBJ_FORMAT 1 #endif which defaults to undefined on unknown platforms. Defaulting to non-ELF is correct, it just means that we won't rely on ELF-specific functionality. I've added a comment to explain that.
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