scripts/sorttable: Make compare_extable() into two functions

Instead of having the compare_extable() part of the sorttable.h header
where it get's defined twice, since it is a very simple function, just
define it twice in sorttable.c, and then it can use the proper read
functions for the word size and endianess and the Elf_Addr macro can be
removed from sorttable.h.

Also add a micro optimization. Instead of:

    if (a < b)
        return -1;
    if (a > b)
        return 1;
    return 0;

That can be shorten to:

   if (a < b)
      return -1;
   return a > b;

Cc: bpf <bpf@vger.kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Zheng Yejian <zhengyejian1@huawei.com>
Cc: Martin  Kelly <martin.kelly@crowdstrike.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/20250105162344.945299671@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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