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FreeBSD's <sys/cdefs.h> is broken. Cygwin is also affected by that.
We need to avoid using them.
See also:
d1c67819db
https://sourceware.org/git/?p=newlib-cygwin.git;a=commit;f=newlib/libc/include/sys/cdefs.h;h=44d6d53977e6bc82c2b1e6dbe8ae7f310b260604