[gdk-pixbuf] tests: Add truncated (and broken) ICO file

[Bastien Nocera <hadess src gnome org>]

commit 67a02e1bfef1ae8f7fa50ca36f6d922c1b6d3ed6
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Jul 27 13:29:52 2017 +0100

    tests: Add truncated (and broken) ICO file
    
    The loader should return an error in that case.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778204

 tests/test-images/fail/bug778204.ico |  Bin 0 -> 8 bytes
 1 files changed, 0 insertions(+), 0 deletions(-)
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diff --git a/tests/test-images/fail/bug778204.ico b/tests/test-images/fail/bug778204.ico
new file mode 100644
index 0000000..a6b98b0
Binary files /dev/null and b/tests/test-images/fail/bug778204.ico differ