Modules: Remove unnecessary .NoDartCoverage file in build tree

In-source builds were accidentally installing it as part of the source
tree's `Modules` directory.  The file was added by commit e131bfb462
(bug fix and some cleanup, 2002-12-03, v2.4.0~4793), but we have no
`Modules` in the build tree anyway.

CMakeLists.txt

@@ -269,7 +269,6 @@ macro(CMAKE_SETUP_TESTING)
   # configure some files for testing
   configure_file(Templates/CTestScript.cmake.in CTestScript.cmake @ONLY)
   configure_file(Tests/.NoDartCoverage Tests/.NoDartCoverage)
-  configure_file(Tests/.NoDartCoverage Modules/.NoDartCoverage)
   configure_file(CTestCustom.cmake.in CTestCustom.cmake @ONLY)
 endmacro()