branch staging updated (5dd7bd1 -> f6dadee)

[guix-commits]

rhelling pushed a change to branch staging
in repository guix.

      from  5dd7bd1   gnu: fontforge: Update to 20190317.
       new  34b81a9   gnu: libdrm: Switch to meson-build-system.
       new  f6dadee   gnu: mesa: Update to 18.3.5.

The 2 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 gnu/packages/gl.scm      | 50 ++++++++++++++++++++++++++----------------------
 gnu/packages/sdl.scm     |  7 +++++--
 gnu/packages/xdisorg.scm | 20 +++++++++----------
 3 files changed, 42 insertions(+), 35 deletions(-)