Tests/RunCMake: Tolerate valgrind lines in CMake output

When RunCMake tests run during dynamic analysis, valgrind may add lines
of the form "==[0-9]+==..." to the output.  Remove such lines from the
actual output before matching it against the expected output.
Merge topic 'RunCMake-ignore-valgrind-lines' into next

4953330 Tests/RunCMake: Tolerate valgrind lines in CMake output