Enchanted Makefile to umount loop device if it was mounted from the build...

Enchanted Makefile to umount loop device if it was mounted from the build script, but the script failed to build
2 jobs for master in 55 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Headless
canceled #339
build_headless

00:00:55

 
  Build Standard
canceled #340
build_standard