STYLE: Remove CMake-language block-end command arguments

Ancient versions of CMake required else(), endif(), and similar block
termination commands to have arguments matching the command starting the block.
This is no longer the preferred style.

cmake/RegexUtils.cmake

@@ -15,5 +15,5 @@ function(test_escape_string_as_regex)
   SET(testRef "\\\\\\.\\^\\$\\-\\+\\*\\(\\)\\[\\]\\?\\|")
   if(NOT test2 STREQUAL testRef)
 	message("Error in the escape_string_for_regex function : \n   ${test1} was escaped as ${test2}, should be ${testRef}")
-  endif(NOT test2 STREQUAL testRef)
+  endif()
 endfunction()