[ClangBuilder] Pass -k to make for test-suite runs #251
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When llvm/llvm-lnt@7688741 enabled using Ninja, it removed the -k flag from make. -k causes make to carry on if there's a build failure.
Without this flag, a single compilation failure turns into thousands of missing executables in the final results. As subsequent targets are not built.
llvm/llvm-lnt#25 is adding an option to the lnt runner to pass options to the build tool.
This PR uses that to pass -k to make to restore the old behaviour on the build bots.