Build: Add missing jpegtran-icc test dependency

The jpegtran-icc test must run after the cjpeg-rgb-islow test, since
the latter generates testout_rgb_islow.jpg.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0c3ee49..fe16d8e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1015,7 +1015,8 @@
     DEPENDS djpeg-${libtype}-rgb-islow)
 
   add_bittest(jpegtran icc "-copy;all;-icc;${TESTIMAGES}/test2.icc"
-    testout_rgb_islow2.jpg testout_rgb_islow.jpg ${MD5_JPEG_RGB_ISLOW2})
+    testout_rgb_islow2.jpg testout_rgb_islow.jpg
+    ${MD5_JPEG_RGB_ISLOW2} cjpeg-${libtype}-rgb-islow)
 
   if(NOT WITH_12BIT)
     # CC: RGB->RGB565  SAMP: fullsize  IDCT: islow  ENT: huff