libc!setmode.c: Avoid #if inside macro call
libc!setmode.c: Avoid #if inside macro call

#if inside macro call is undefined behaviour under the C standard
(3.8.3 paragraph 10 for C90, 6.8.10 paragraph 11 for C99).
The same effect can be achieved with a slightly more verbose construct,
putting the whole macro call inside the #ifdef/#else/#endif.

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