[lldb] Make the `rumtimes` target a test dependency

[JDevlieghere]

Summary

Make the rumtimes target a test dependency

[fdeazeve]

LGTM!

[jingham]

This is needed or the parts of the lldb testsuite that rely on the libcxx & libcxxabi will fail when you do ninja check-lldb. Thanks for fixing this.

lldb/test/CMakeLists.txt

if(TARGET clang)
   if(TARGET tsan)
     add_lldb_test_dependency(tsan)
   endif()
 
   if (TARGET compiler-rt)
     add_lldb_test_dependency(compiler-rt)
   endif()
 
+  if (TARGET runtimes)
+    add_lldb_test_dependency(runtimes)
+  endif()
+
   if(APPLE AND NOT LLVM_TARGET_IS_CROSSCOMPILE_HOST)
     # FIXME: Standalone builds should import the cxx target as well.
     if(LLDB_BUILT_STANDALONE)
       # For now check that the include directory exists.
       set(cxx_dir "${LLVM_BINARY_DIR}/include/c++")
       if(NOT EXISTS ${cxx_dir})
         message(WARNING "LLDB test suite requires libc++ in llvm/projects/libcxx or an existing build symlinked to ${cxx_dir}")
       endif()