gnu: Use full SHA1 commit ids.

gnu: Use full SHA1 commit ids.

* gnu/packages/bioinformatics.scm (pbtranscript-tofu, mosaik,
  smithlab-cpp, piranha): Use full SHA1 commit ids.
* gnu/packages/ci.scm (hydra): Likewise.
* gnu/packages/compression.scm (sfarkxtc): Likewise.
* gnu/packages/emacs.scm (emacs-ob-ipython): Likewise.
* gnu/packages/games.scm (mars, emulation-station): Likewise.
* gnu/packages/gnunet.scm (guile-gnunet): Likewise.
* gnu/packages/music.scm (non-sequencer): Likewise.
* gnu/packages/version-control.scm (git-flow, git-test-sequence): Likewise.
* gnu/packages/xorg.scm (xf86-video-intel): Likewise.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>