Revert "[lldb/Fuzzer] Create ninja target for target fuzzer"

This reverts commit f3250da.

This broke the windows lldb bot: https://lab.llvm.org/buildbot/#/builders/83/builds/19988 and likely others.

Author: sstamenova

lldb/tools/lldb-fuzzer/lldb-target-fuzzer/CMakeLists.txt

@@ -15,9 +15,3 @@ if(TARGET lldb-target-fuzzer)
     lldbFuzzerUtils
     )
 endif()
-
-add_custom_target(fuzz-lldb-target
-  COMMENT "Running the LLDB target fuzzer..."
-  COMMAND cd ${CMAKE_CURRENT_SOURCE_DIR} && $<TARGET_FILE:lldb-target-fuzzer>
-  USES_TERMINAL
-  )