[scripts][buildall] Propogate logged error status through pipe tee

In the non-QUIET case, the log function pipes output to the tee command.
Without the pipefail option, if a make command fails, but the tee exits
succesfully, the overall status is 0 and the failed project doesn't get
added to the FAILED list and reported. Adding the pipefail option
propagates the make failure appropriately and adds the target to the
FAILED list.

scripts/buildall

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -o pipefail
+
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 function HELP {