debug/strace: enforce cross-compilation

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Message-Id: <24b6540a08cbca7ee1fa.1363446263@laptop>
Patchwork-Id: 228220

reporter_name="Yann E. MORIN"

reporter_url="http://ymorin.is-a-geek.org/"

reporter_comment="Toolchain for the Raspberry Pi, with hard-float."