MF projects/building-blocks r275198:

  Use ${.TARGET} instead of hardcoding the name in the dump build rule
Shrink boot2 a bit more by factoring out common pattern
of printf();return(-1);

This shrinks it by 8bytes using clang35 and by 12bytes using clang34.
MFi386: r275237 (by rdivacky)

  Shrink boot2 a bit more by factoring out common pattern
  of printf();return(-1);