configure: add missing dependancies for gpl tests

fixes fate without --enable-gpl
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -1921,6 +1921,9 @@ showspectrum_filter_deps="avcodec"
 super2xsai_filter_deps="gpl"
 tinterlace_filter_deps="gpl"
 yadif_filter_deps="gpl"
+pixfmts_super2xsai_test_deps="super2xsai_filter"
+tinterlace_merge_test_deps="tinterlace_filter"
+tinterlace_pad_test_deps="tinterlace_filter"
 
 # libraries
 avdevice_deps="avcodec avformat"