[gegl] tests: force mipmap unsharp-crop test to use 2 threads

[Øyvind Kolås <ok src gnome org>]

commit 25ab1530bad531c4790f7bb7a74d3c2454f90174
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Nov 16 02:56:19 2017 +0100

    tests: force mipmap unsharp-crop test to use 2 threads
    
    See bug #790424

 tests/mipmap/unsharp-crop.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/mipmap/unsharp-crop.sh b/tests/mipmap/unsharp-crop.sh
index f4568e5..2225d3a 100755
--- a/tests/mipmap/unsharp-crop.sh
+++ b/tests/mipmap/unsharp-crop.sh
@@ -8,7 +8,7 @@ if [ ! -f $abs_top_builddir/bin/gegl ]; then
   echo "Skipping test-unsharp-crop due to lack of gegl executable"
   exit 77
 else
-  GEGL_TILE_SIZE=8x8 GEGL_PATH=$abs_top_builddir/operations GEGL_USE_OPENCL=no GEGL_MIPMAP_RENDERING=1 
$abs_top_builddir/bin/gegl                                       \
+  GEGL_TILE_SIZE=8x8 GEGL_THREADS=2 GEGL_PATH=$abs_top_builddir/operations GEGL_USE_OPENCL=no 
GEGL_MIPMAP_RENDERING=1 $abs_top_builddir/bin/gegl                                       \
           -s 0.33 $abs_top_srcdir/tests/compositions/data/car-stack.png -o      \
           $abs_top_builddir/tests/mipmap/unsharp-crop-output.png           \
           -- unsharp-mask scale=10.0 crop x=147 y=66 width=200 height=200 \