Merge pull request #1307 from gpryor/1.6

cmake: fix to reporting missing pkgs

CMakeLists.txt

@@ -423,7 +423,7 @@ foreach(option IN LISTS options)
     else ()
         set(value "${${option}}")
     endif ()
-    find_package_message(${option} "${option}: ${value}" ${value})
+    find_package_message("${option}" "${option}: ${value}" "${value}")
 endforeach(option)
 list_optional_packages()
 message (STATUS "")