- selinux: hang on to the list of selinux contexts, freeing and reloading
it only when the file we read it from is modified, freeing it when the
shared library is being unloaded (#845125)
- back out this labeling change (dwalsh):
- when building the new label for a file we're about to create, also mix
in the current range, in addition to the current user
- when building the new label for a file we're about to create, also mix
in the current range, in addition to the current user
- also package the PDF format admin, user, and install guides
- drop some PDFs that no longer get built right
