[gegl] Remove HUGE matting global test images

[Ãyvind KolÃs <ok src gnome org>]

commit 1edce2c0bdf6376b112371a42185c62a94a0599b
Author: Ãyvind KolÃs <pippin gimp org>
Date:   Sat Mar 24 20:08:30 2012 +0000

    Remove HUGE matting global test images
    
    These images are too large to be included in a tarball, they've accidentally
    been added to git master, thus developers cloning GEGL will now have to
    download these massive files, sorry about that.

 tests/compositions/data/matting-global-big.jpg     |  Bin 4477201 -> 0 bytes
 .../data/matting-global-big_scribble.png           |  Bin 161832 -> 0 bytes
 tests/compositions/matting-global-big.xml          |   20 --------------------
 3 files changed, 0 insertions(+), 20 deletions(-)