[scilab/f19] (7 commits) ...Backport and use some features

[Clément David]

Summary of changes:

  b189c01... Update to 5.4.1 (*)
  f842804... Add the new 5.4.1 sources (*)
  9300b7c... Rebuild for hdf5 1.8.11 (*)
  7ed8fa1... Try to fix the build using hardened built. (*)
  8eb057d... Remove any ./configure flags (*)
  0453380... Add patch to fix i686 build by using dynamic stack (*)
  007f27b... Backport and use some features (*)

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