Use md5 -q for HashProgramOutput.sh, to show only the checksum.

Summary:
This option is supported on both BSDs and macOS, and ensures the command
also works if GNU coreutils are not installed.

Reviewers: ddunbar, jdoerfert, serge-sans-paille, tra

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D83411
1 file changed