Add char * overload for FlatBufferBuilder::CreateString() (#4583)
Add char * overload for FlatBufferBuilder::CreateString() (#4583)

Without this change, the compiler tries to select the following overload
when CreateString is passed a `char *`:

    template<typename T>
    Offset<String> CreateString(const T &str) {
      return CreateString(str.c_str(), str.length());
    }

which is not valid since char pointers don't have methods.

(Fixes #4579)

Signed-off-by: Andrew Gunnerson <d42c9a3ddb67c545397dd6adf8c46b3812f6b8ce@cxl.epac.to>
hgl888/flatbuffers,google/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,google/flatbuffers,alexames/flatbuffers,rw/flatbuffers,google/flatbuffers,evolutional/flatbuffers,google/flatbuffers,evolutional/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,google/flatbuffers,hgl888/flatbuffers,evolutional/flatbuffers,DavadDi/flatbuffers,rw/flatbuffers,rw/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,chenkai036/flatbuffers,royalharsh/flatbuffers,stewartmiles/flatbuffers,alexames/flatbuffers,hgl888/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,evolutional/flatbuffers,pjulien/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,chenkai036/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,royalharsh/flatbuffers,royalharsh/flatbuffers,chenkai036/flatbuffers,chenkai036/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,royalharsh/flatbuffers,rw/flatbuffers,stewartmiles/flatbuffers,royalharsh/flatbuffers,rw/flatbuffers,google/flatbuffers,royalharsh/flatbuffers,stewartmiles/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,chenkai036/flatbuffers,evolutional/flatbuffers,chenkai036/flatbuffers,chenkai036/flatbuffers,hgl888/flatbuffers,rw/flatbuffers,google/flatbuffers,rw/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,google/flatbuffers,royalharsh/flatbuffers,rw/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,pjulien/flatbuffers,hgl888/flatbuffers,alexames/flatbuffers,google/flatbuffers,chenkai036/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,DavadDi/flatbuffers,DavadDi/flatbuffers,alexames/flatbuffers,rw/flatbuffers,royalharsh/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,hgl888/flatbuffers,chenkai036/flatbuffers,rw/flatbuffers,rw/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,google/flatbuffers,pjulien/flatbuffers,google/flatbuffers,google/flatbuffers,DavadDi/flatbuffers,rw/flatbuffers,pjulien/flatbuffers,DavadDi/flatbuffers,royalharsh/flatbuffers,alexames/flatbuffers,chenkai036/flatbuffers,evolutional/flatbuffers,evolutional/flatbuffers,royalharsh/flatbuffers,stewartmiles/flatbuffers,alexames/flatbuffers,google/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,DavadDi/flatbuffers,pjulien/flatbuffers