protobuf: fix build error

[mmuetzel]

Protobuf doesn't build for staging with the following error:

  google/protobuf/struct.pb.cc: At global scope:
  google/protobuf/struct.pb.cc:47:110: error: 'constinit' variable 'google::protobuf::_Struct_default_instance_' does not have a constant initializer
     47 | PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 StructDefaultTypeInternal _Struct_default_instance_;
        |                                                                                                              ^~~~~~~~~~~~~~~~~~~~~~~~~
  google/protobuf/struct.pb.cc:47:110:   in 'constexpr' expansion of 'google::protobuf::StructDefaultTypeInternal()'
  google/protobuf/struct.pb.cc:41:9: error: 'constexpr google::protobuf::Struct::Struct(google::protobuf::internal::ConstantInitialized)' called in a constant expression
     41 |       : _instance(::_pbi::ConstantInitialized{}) {}
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  google/protobuf/struct.pb.cc:35:20: note: 'constexpr google::protobuf::Struct::Struct(google::protobuf::internal::ConstantInitialized)' declared here
     35 | PROTOBUF_CONSTEXPR Struct::Struct(
        |                    ^~~~~~
  make[2]: *** [Makefile:4514: google/protobuf/struct.pb.lo] Error 1

Use patch based on upstream to avoid that build error.

[lazka]

oh, thanks. I had already given up :)

[mmuetzel]

No worries. Feel free to close if this is no longer needed.