[babl] tests: remove duplicate extract test

[Øyvind "pippin" Kolås <ok src gnome org>]

commit fd5260bd228fbf75ed4ca35cafa6bbc93b4e09b5
Author: John Marshall <jtm home gmail com>
Date:   Tue May 29 15:37:08 2018 +0100

    tests: remove duplicate extract test

 tests/Makefile.am | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index a1ccf0c..e81fd62 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -21,7 +21,6 @@ C_TESTS =                             \
        types   \
        format_with_space   \
        palette \
-       extract \
        nop \
        n_components            \
        n_components_cast \