Brad King e2b9e7f7bc Tests: Drop unnecessary stderr matching from RunCMake.ctest_memcheck
The Dummy*-stderr.txt files were needed only to match platform-specific
memcheck tooling output and verify that stderr is otherwise empty.  Now
that the RunCMake infrastructure knows how to strip such lines before
matching, we can simply drop these files and use the default empty
string match.
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This directory contains tests that run CMake to configure a project
but do not actually build anything.  To add a test:

1. Add a subdirectory named for the test, say ``<Test>/``.

2. In ``./CMakeLists.txt`` call ``add_RunCMake_test`` and pass the
   test directory name ``<Test>``.

3. Create script ``<Test>/RunCMakeTest.cmake`` in the directory containing::

    include(RunCMake)
    run_cmake(SubTest1)
    ...
    run_cmake(SubTestN)

   where ``SubTest1`` through ``SubTestN`` are sub-test names each
   corresponding to an independent CMake run and project configuration.

   One may also add calls of the form::

    run_cmake_command(SubTestI ${CMAKE_COMMAND} ...)

   to fully customize the test case command-line.

   Alternatively, if the test is to cover running ``ctest -S`` then use::

    include(RunCTest)
    run_ctest(SubTest1)
    ...
    run_ctest(SubTestN)

   and create ``test.cmake.in``, ``CTestConfig.cmake.in``, and
   ``CMakeLists.txt.in`` files to be configured for each case.

4. Create file ``<Test>/CMakeLists.txt`` in the directory containing::

    cmake_minimum_required(...)
    project(${RunCMake_TEST} NONE) # or languages needed
    include(${RunCMake_TEST}.cmake)

   where ``${RunCMake_TEST}`` is literal.  A value for ``RunCMake_TEST``
   will be passed to CMake by the ``run_cmake`` macro when running each
   sub-test.

5. Create a ``<Test>/<SubTest>.cmake`` file for each sub-test named
   above containing the actual test code.  Optionally create files
   containing expected test results:

   ``<SubTest>-result.txt``
    Process result expected if not "0"
   ``<SubTest>-stdout.txt``
    Regex matching expected stdout content
   ``<SubTest>-stderr.txt``
    Regex matching expected stderr content, if not "^$"
   ``<SubTest>-check.cmake``
    Custom result check.

   Note that trailing newlines will be stripped from actual and expected
   test output before matching against the stdout and stderr expressions.
   The code in ``<SubTest>-check.cmake`` may use variables

   ``RunCMake_TEST_SOURCE_DIR``
    Top of test source tree
   ``RunCMake_TEST_BINARY_DIR``
    Top of test binary tree

   and an failure must store a message in ``RunCMake_TEST_FAILED``.