configure: introduce new macro AX_LIB_ELFUTILS
authorJérémie Galarneau <jeremie.galarneau@efficios.com>
Thu, 28 Apr 2016 22:07:48 +0000 (18:07 -0400)
committerJérémie Galarneau <jeremie.galarneau@efficios.com>
Thu, 28 Apr 2016 22:13:48 +0000 (18:13 -0400)
elfutils has only just started providing pkg-config metadata
which makes the current version check unreliable. This introduces
a new M4 macro which checks elfutils' version using the
_ELFUTILS_PREREQ macro (defined in elfutils/version.h).

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

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