[Bug 3613] Lack of feature test macros in building config

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3613

--- Comment #1 from Dan Fandrich <dan at coneharvesters.com>  ---
Looks fine to me. The equivalent could also be added to CPPFLAGS in
Makefile.flags if needed for target compilation as well.

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