[test][GWP-ASan] Only add check-gwp_asan when its dependencies are built (#89164)

Currently, `check-gwp_asan` is added no matter its dependencies are
built or not, this is wrong and will cause cmake error when scudo is not
built. This patch includes the target in the dependencies check.

Author: yingcong-wu

compiler-rt/test/gwp_asan/CMakeLists.txt

@@ -35,9 +35,9 @@ if (COMPILER_RT_INCLUDE_TESTS AND COMPILER_RT_HAS_SCUDO_STANDALONE AND COMPILER_
       ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/lit.site.cfg.py)
     list(APPEND GWP_ASAN_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME})
   endforeach()
-endif()
 
-add_lit_testsuite(check-gwp_asan "Running the GWP-ASan tests"
-  ${GWP_ASAN_TESTSUITES}
-  DEPENDS ${GWP_ASAN_TEST_DEPS})
-set_target_properties(check-gwp_asan PROPERTIES FOLDER "Compiler-RT Misc")
+  add_lit_testsuite(check-gwp_asan "Running the GWP-ASan tests"
+    ${GWP_ASAN_TESTSUITES}
+    DEPENDS ${GWP_ASAN_TEST_DEPS})
+  set_target_properties(check-gwp_asan PROPERTIES FOLDER "Compiler-RT Misc")
+endif()