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 <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nicolas Schier <[email protected]>
Cc: Zheng Yejian <[email protected]>
Cc: Martin  Kelly <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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