[lldb] Fix building LLDB standlone without framework

[bulbazord]

Summary

In a809720102fae8d1b5a7073f99f9dae9395c5f41 I refactored some logic to
deal with the clang resource directory in standalone LLDB builds.
However, this logic escaped me because it only runs when you do not
build LLDB.framework.

[JDevlieghere]

Thanks!

lldb/source/API/CMakeLists.txt

 else()
   # In a standalone build create a symlink from the LLDB library directory that points to the
   # resource directory in the Clang library directory. LLDB searches relative to its install path,
   # and the symlink is created in the same relative path as the resource directory of Clang when
   # building alongside Clang.
   # When building the LLDB framework, this isn't necessary as there we copy everything we need into
   # the framework (including the Clang resourece directory).
   if(NOT LLDB_BUILD_FRAMEWORK)
-    set(LLDB_CLANG_RESOURCE_DIR_PARENT "$<TARGET_FILE_DIR:liblldb>/clang")
-    file(MAKE_DIRECTORY "${LLDB_CLANG_RESOURCE_DIR_PARENT}")
+    set(LLDB_CLANG_RESOURCE_DIR "$<TARGET_FILE_DIR:liblldb>/clang")
     add_custom_command(TARGET liblldb POST_BUILD
-      COMMENT "Linking Clang resource dir into LLDB build directory: ${LLDB_CLANG_RESOURCE_DIR_PARENT}"
-      COMMAND ${CMAKE_COMMAND} -E make_directory "${LLDB_CLANG_RESOURCE_DIR_PARENT}"
-      COMMAND ${CMAKE_COMMAND} -E create_symlink "${LLDB_EXTERNAL_CLANG_RESOURCE_DIR}"
-              "${LLDB_CLANG_RESOURCE_DIR_PARENT}/${LLDB_CLANG_RESOURCE_DIR_NAME}"
+      COMMENT "Linking Clang resource dir into LLDB build directory: ${LLDB_CLANG_RESOURCE_DIR}"
+      COMMAND ${CMAKE_COMMAND} -E create_symlink
+      "${LLDB_EXTERNAL_CLANG_RESOURCE_DIR}" "${LLDB_CLANG_RESOURCE_DIR}"
     )
   endif()
 endif()
 
 if(LLDB_BUILD_FRAMEWORK)
   include(LLDBFramework)
 
   if (TARGET install-liblldb)