[lldb] Fix building LLDB standlone without framework

In a809720 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.

Differential Revision: https://reviews.llvm.org/D156763

(cherry picked from commit 6888de1)

Author: bulbazord

lldb/source/API/CMakeLists.txt

@@ -204,13 +204,11 @@ else()
   # 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()