(part 1) no package flags when building cmi files

[bobzhang]

seems

-bs-package-name graph -bs-ns Graph

The first part is not needed for cmi, the latter is still needed for cmi

rule cmji
  command = $bsc $g_pkg_flg $g_lib_incls $warnings $bsc_flags -o $out $in
  dyndep = $in_e.d
  restat = 1

we should expand g_pkg_flg locally to make use of $in_d which means rules has to take advantage of package info earlier