* flux-sched: fix compilation errors
configure was being run twice becuase the staging symlinks were
confusing autotools
mirror flux-core in building in a subdirectory to avoid other common
compilation problems, like the one in PR #3543
* flux-core: update dependencies
munge is no longer a dependency
provide hints for lua version so that `spack install flux-core` works
"out-of-the-box". Currently, when no explicity version is provided, the
concretizer attempts to use lua@5.3, which is invalid. Closes#10000
92229e46e3