Set the minimal version of elfutils to 0.154

elfutils 0.154 is required since it is the first release to
include commit 5479725 (dwarf_highpc: Handle DW_AT_high_pc being
a constant offset from DW_AT_low_pc).

This is fix is required to read DwARF information produced by
"modern" (post-2012) GCCs which make use of this DWARF4
capability when generating position independant code. The binaries
provided as part of the test suite make use of this feature. Hence,
tests will fail with older elfutils versions.

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