[orc-rt] Remove unused LLVM_RT_TOOLS_BINARY_DIR cmake variable. (#154254)

This was accidentally left in ee7a6a4.

Author: lhames

runtimes/CMakeLists.txt

@@ -44,7 +44,6 @@ if(LLVM_ENABLE_RUNTIMES STREQUAL "all" )
 endif()
 include(SortSubset)
 sort_subset("${LLVM_SUPPORTED_RUNTIMES}" "${LLVM_ENABLE_RUNTIMES}" LLVM_ENABLE_RUNTIMES)
-set(LLVM_RT_TOOLS_BINARY_DIR ${LLVM_TOOLS_BINARY_DIR} CACHE STRING "runtime path to required test tools")
 foreach(proj ${LLVM_ENABLE_RUNTIMES})
   set(proj_dir "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
   if(IS_DIRECTORY ${proj_dir} AND EXISTS ${proj_dir}/CMakeLists.txt)