Adds [ERROR] tag

Author: remram44

CMakeLists.txt

@@ -125,7 +125,7 @@ find_package(Git)
 if(NOT GIT_PROTOCOL)
   set(GIT_PROTOCOL "git://" CACHE STRING "Choose protocol to be used by git" FORCE)
   set_property(CACHE GIT_PROTOCOL PROPERTY STRINGS "git://" "http://")
-  message(FATAL_ERROR "Select either git:// or http:// for checking out git submodules.
+  message(FATAL_ERROR "[ERROR] Select either git:// or http:// for checking out git submodules.
            If you are behind a firewall then likely you need to choose http:// instead.")
 endif()