[gn build] Port 969a51f

Author: llvmgnsyncbot

llvm/utils/gn/secondary/compiler-rt/lib/asan/BUILD.gn

@@ -199,7 +199,7 @@ source_set("unused") {
     "asan_win_dynamic_runtime_thunk.cpp",
 
     # FIXME: These are in clang_rt.asan_static in the CMake build.
-    "asan_rtl_static.cpp",
+
     "asan_rtl_x86_64.S",
   ]
 }