[gn build] Port 75e8620

Author: llvmgnsyncbot

llvm/utils/gn/secondary/lldb/source/API/BUILD.gn

@@ -109,6 +109,7 @@ target(liblldb_type, "liblldb") {
     "SBValueList.cpp",
     "SBVariablesOptions.cpp",
     "SBWatchpoint.cpp",
+    "SBWatchpointOptions.cpp",
     "SystemInitializerFull.cpp",
   ]