binfmt_elf: Use elf_load() for library

While load_elf_library() is a libc5-ism, we can still replace most of
its contents with elf_load() as well, further simplifying the code.

Some historical context:
- libc4 was a.out and used uselib (a.out support has been removed)
- libc5 was ELF and used uselib (there may still be users)
- libc6 is ELF and has never used uselib

Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Suggested-by: Eric Biederman <[email protected]>
Tested-by: Pedro Falcato <[email protected]>
Signed-off-by: Sebastian Ott <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

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