[gdk-pixbuf] tests: Replace non-free "lena" reference image

[Bastien Nocera <hadess src gnome org>]

commit 53ffd56a82af351044762e6369ac36d94230522d
Author: Olly Betts <olly survex com>
Date:   Tue Sep 19 11:07:13 2017 +0200

    tests: Replace non-free "lena" reference image
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787050

 tests/test-images/reftests/cat.jpg          |  Bin 0 -> 59606 bytes
 tests/test-images/reftests/cat.jpg.ref.png  |  Bin 0 -> 147793 bytes
 tests/test-images/reftests/lena.jpg         |  Bin 65591 -> 0 bytes
 tests/test-images/reftests/lena.jpg.ref.png |  Bin 249277 -> 0 bytes
 4 files changed, 0 insertions(+), 0 deletions(-)
---
diff --git a/tests/test-images/reftests/cat.jpg b/tests/test-images/reftests/cat.jpg
new file mode 100644
index 0000000..d24684a
Binary files /dev/null and b/tests/test-images/reftests/cat.jpg differ
diff --git a/tests/test-images/reftests/cat.jpg.ref.png b/tests/test-images/reftests/cat.jpg.ref.png
new file mode 100644
index 0000000..4a42efa
Binary files /dev/null and b/tests/test-images/reftests/cat.jpg.ref.png differ