[CMake] Adjusting CTest Test.xml results for Jenkins

[Игорь Иванов]

We are using Jenkins and want it to parse CTest results. There is 
already a plugin for that, that takes Test.xml produced by `ctest -T 
Test` as an input. In `Test.xml` there are records like this:

<Test Status="passed">
         <Name>TEST-netutils</Name>
<Path>/var/lib/jenkins/workspace/build/tech1utils</Path>
<FullName>/var/lib/jenkins/workspace/build/tech1utils/TEST-netutils</FullName>
<FullCommandLine>/var/lib/jenkins/workspace/build/tech1utils/test-netutils-core2</FullCommandLine>

We run `cmake --build; ctest` multiple times in different directories 
for x86+x64 and Debug+Release builds, which results in multiple 
`Test.xml` files. After aggregating them, Jenkins plugin outputs report 
like this:

   projectroot.var.lib.jenkins.workspace.build:
     tech1utils:
       TEST_netutils  5.3 sec  Passed
       TEST_netutils  5.1 sec  Passed
       TEST_netutils  2.8 sec  Passed
       TEST_netutils  2.9 sec  Passed

which is kinda unreadable, you cannot immediately guess which test is 
which one. Turns out that if we replace the <Path> property in XML from 
`/var/lib/jenkins/workspace/build` to something like `build-32-debug`, 
the report becomes more readable:

   projectroot.build-32-debug:
     tech1utils:
       TEST_netutils  5.3 sec  Passed
   projectroot.build-64-debug:
     tech1utils:
       TEST_netutils  5.1 sec  Passed
   ...

Is it possible to feed to CTest some -Dparameters or ENV_VARS to provide 
needed values in Path, instead of writing a script to replace XML 
contents afterwards?
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