[lldb] Add forward declaration for SBWatchpointOptions in SBDefines.h

(cherry picked from commit a322d50)

Author: bulbazord

lldb/include/lldb/API/SBDefines.h

@@ -126,6 +126,7 @@ class LLDB_API SBValue;
 class LLDB_API SBValueList;
 class LLDB_API SBVariablesOptions;
 class LLDB_API SBWatchpoint;
+class LLDB_API SBWatchpointOptions;
 class LLDB_API SBUnixSignals;
 
 typedef bool (*SBBreakpointHitCallback)(void *baton, SBProcess &process,