[sr #110809] UBSAN failure in output.c:511 (make_room_for)

[Bruno Haible]

Follow-up Comment #3, sr #110809 (group m4):

ISO WG14 has voted to accept
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf, see
https://sourceware.org/pipermail/libc-alpha/2024-October/160375.html . With
this change, memcpy(dest, NULL, 0) is no longer undefined, and GCC and glibc
ought to catch up soon (GCC regarding their sanitizer, and glibc regarding the
declaration of memcpy() in <string.h>).


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