tools/power turbostat: Add local build_bug.h header for snapshot target

Fixes compilation errors for Makefile snapshot target described in:
commit 231ce08b

 ("tools/power turbostat: Add "snapshot:" Makefile target")

Signed-off-by: Patryk Wlazlyn <patryk.wlazlyn@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>