Log Message:
Import bam-0.4.0 as devel/bam.

Packaged by Timo Buhrmester in PR 50234.

Bam is a fast and flexible build system. Bam uses Lua to describe the
build process. It's takes its inspiration for the script files from
scons. While scons focuses on being 100% correct when building, bam
makes a few sacrifices to acquire fast full and incremental build times.