[gdk-pixbuf] tests: Add test for bug 766890

[Bastien Nocera <hadess src gnome org>]

commit 69962e278fb03c572c06d2a5c08c20574db922cf
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Dec 19 18:30:04 2016 +0100

    tests: Add test for bug 766890
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766890

 tests/test-images/reftests/mandatory-bitmasks.bmp  |  Bin 0 -> 560070 bytes
 .../reftests/mandatory-bitmasks.bmp.ref.png        |  Bin 0 -> 86967 bytes
 2 files changed, 0 insertions(+), 0 deletions(-)
---
diff --git a/tests/test-images/reftests/mandatory-bitmasks.bmp 
b/tests/test-images/reftests/mandatory-bitmasks.bmp
new file mode 100644
index 0000000..b107d52
Binary files /dev/null and b/tests/test-images/reftests/mandatory-bitmasks.bmp differ
diff --git a/tests/test-images/reftests/mandatory-bitmasks.bmp.ref.png 
b/tests/test-images/reftests/mandatory-bitmasks.bmp.ref.png
new file mode 100644
index 0000000..1d0c602
Binary files /dev/null and b/tests/test-images/reftests/mandatory-bitmasks.bmp.ref.png differ