[sr #110392] Define _NETBSD_SOURCE and _OPENBSD_SOURCE in AC_USE_SYSTEM_EXTENSIONS

Follow-up Comment #2, sr #110392 (project autoconf):

Hi Zack,

Thanks for the commit!
Please note that "Enable OpenBSD extensions on NetBSD." was not a typo.  It is
really meant for use *on NetBSD* (not on OpenBSD).

From NetBSD documentation:
https://man.netbsd.org/reallocarray.3
#define _OPENBSD_SOURCE

And also about BSD portability:
https://learnbchs.org/portability-page2.html
#if defined(__NetBSD__)
# define _OPENBSD_SOURCE /* reallocarray */
#endif

-- 
Julien ÉLIE

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