wasm: QDataStream not working with sockets

Taking into account the changes to enable socket use in wasm:

https://codereview.qt-project.org/c/qt/qtbase/+/269904

https://codereview.qt-project.org/c/qt/qtbase/+/272693

QDataStream is not returning data using the fortuneclient or blockingfortuneclient example apps.

Issue in QString QDataStream &operator>>

in >> bytes; results in ReadPastEnd, as it is trying to read more data than the buffer actually has ( 1131375984 as opposed to 56)

so, the buffer contains 56 bytes, it reads 4, then tries to read 1131375984, gets 52, and then fails.