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configure: Add AC_USE_SYSTEM_EXTENSIONS & require autoconf 2.70

Alan Coopersmith requested to merge alanc/xcompmgr:reallocarray into master

AC_USE_SYSTEM_EXTENSIONS is needed on some systems to expose the reallocarray() prototype in stdlib.h.

A minimum of autoconf 2.70 is needed for builds on NetBSD to work correctly, since it depends on AC_USE_SYSTEM_EXTENSIONS defining _OPENBSD_SOURCE to expose the prototype for reallocarray() in stdlib.h

Closes: #5 (closed)
Fixes: fb596ae3 ("Use reallocarray() if it is available")
Signed-off-by: Alan Coopersmith alan.coopersmith@oracle.com

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