Fix running dng writing testsuite in meson

tests/meson.build

@@ -3,9 +3,10 @@ check_mode = executable('check_mode', 'check_mode.c', 'greatest.h',
     link_with: libdng,
     install: false,
 )
-check_mode = executable('check_dng', 'check_dng.c', 'greatest.h',
+check_dng = executable('check_dng', 'check_dng.c', 'greatest.h',
     include_directories: inc,
     link_with: libdng,
+    dependencies: libtiff,
     install: false,
 )