[lldb] Explicitly qualify calls to std::static_pointer_cast

Due to a c++ quirk, these are found through ADL only when a function with that
name is found through regular lookup. We have one such function in SharingPtr.h,
but I am trying to remove it.
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
index 12b05e7..83aca6a 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
@@ -3479,7 +3479,7 @@
           return error;
         } else
           options.setTraceParams(
-              static_pointer_cast<StructuredData::Dictionary>(
+              std::static_pointer_cast<StructuredData::Dictionary>(
                   custom_params_sp));
       }
     } else {