Remove velox_join_fuzzer_lib from CMakeLists.

Author: xin-zhang2

velox/exec/fuzzer/CMakeLists.txt

@@ -95,16 +95,11 @@ target_link_libraries(
   velox_exec_test_lib
   velox_expression_test_utility)
 
-add_library(velox_join_fuzzer_lib JoinFuzzer.cpp)
-
 # Join Fuzzer.
-add_executable(velox_join_fuzzer JoinFuzzerRunner.cpp)
-
-target_link_libraries(
-  velox_join_fuzzer velox_join_fuzzer_lib)
+add_executable(velox_join_fuzzer JoinFuzzerRunner.cpp JoinFuzzer.cpp)
 
 target_link_libraries(
-  velox_join_fuzzer_lib
+  velox_join_fuzzer
   velox_type
   velox_vector_fuzzer
   velox_fuzzer_util