Add latest version of lcms (#4066)

var/spack/repos/builtin/packages/lcms/package.py

@@ -30,10 +30,11 @@ class Lcms(AutotoolsPackage):
        transforms between ICC profiles. It is focused on speed, and is
        portable across several platforms (MIT license)."""
     homepage = "http://www.littlecms.com"
-    url      = "http://downloads.sourceforge.net/project/lcms/lcms/2.6/lcms2-2.6.tar.gz"
+    url      = "http://downloads.sourceforge.net/project/lcms/lcms/2.8/lcms2-2.8.tar.gz"
 
+    version('2.8', '87a5913f1a52464190bb655ad230539c')
     version('2.6', 'f4c08d38ceade4a664ebff7228910a33')
 
-    depends_on("jpeg")
-    depends_on("libtiff")
-    depends_on("zlib")
+    depends_on('jpeg')
+    depends_on('libtiff')
+    depends_on('zlib')