message: update to release 1.0.15
  updatae to new relase needed because compiler crashed on ubuntu
  14.04 & 16.04 with older versions installed.
  solves
  see also
diff: # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  package=libsodium
  -$(package)_version=1.0.13
  +$(package)_version=1.0.15
  $(package)_download_path=https://download.libsodium.org/libsodium/releases
  $(package)_file_name=$(package)-$($(package)_version).tar.gz
  -$(package)_sha256_hash=9c13accb1a9e59ab3affde0e60ef9a2149ed4d6e8f99c93c7a5b97499ee323fd
  +$(package)_sha256_hash=RWQf6LRCGA9i53mlYecO4IzT51TGPpvWucNSCh1CBM0QTaLn73Y7GFO3
  $(package)_dependencies=
  $(package)_config_opts=
  $(package)_config_opts_linux=--with-pic
  