systemtap_target_arch() should also translate x86-64 (hyphenated) into
x86_64 for the -a param. Failing to do that causes systemtap to see
an architecture mismatch and create a cloned session with a bogusly
synthesized build directory path, and fails to compile the probe.
Fixes [YOCTO #3756]
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
