[pure/f16] (4 commits) ...Update to 0.48

[Michel Alexandre Salim]

Summary of changes:

  df4bfdc... comment out clang build dependency for now; try again with  (*)
  2f0accc... rebuild with new gmp (*)
  c92fcae... rebuild with new gmp without compat lib (*)
  4dea43c... Update to 0.48 (*)

(*) This commit already existed in another branch; no separate mail sent