Add quoting to makefile message.
Add quoting to makefile message.

atomicobject/heatshrink,senyor/heatshrink,senyor/heatshrink,jordandcarter/heatshrink,unixdj/heatshrink-c,jordandcarter/heatshrink,silentbicycle/heatshrink,atomicobject/heatshrink,silentbicycle/heatshrink