When building with -DWITH_WSREP=OFF, files required for MTR tests are
excluded and several tests fail. This is cause by a recent commit
7b44d0ba which attempted to resolve MDEV-23230.

Even when building without WSREP/Galera support some of the MTR include
files named *wsrep* are required by other tests.

Removing the following from the CMake install macros will avoid
excluding the MTR test .inc files:
`|include/((w.*)?wsrep.*|.*galera.*)\\.inc`

All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the
BSD-new license. I am contributing on behalf of my employer
Amazon Web Services, Inc.