Revert "Add support for LLVM_NATIVE_TOOL_DIR flag"

This reverts commit 718a2c9.

Author: adazem009

build/HunterPackages.cmake

@@ -58,10 +58,6 @@ set(HUNTER_LLVM_CMAKE_ARGS
     LLVM_TARGETS_TO_BUILD=host
 )
 
-if(LLVM_NATIVE_TOOL_DIR)  
-    set(HUNTER_LLVM_CMAKE_ARGS ${HUNTER_LLVM_CMAKE_ARGS} LLVM_NATIVE_TOOL_DIR=${LLVM_NATIVE_TOOL_DIR})  
-endif()
-
 if(CMAKE_BUILD_TYPE EQUAL "Debug")
     set(HUNTER_LLVM_CMAKE_ARGS ${HUNTER_LLVM_CMAKE_ARGS} LLVM_ENABLE_ASSERTIONS=ON)
 else()