[5/6] webservices: Implement WsReadXmlBuffer.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=31634

Your paranoid android.


=== w7u (32 bit reader) ===
reader.c:5208: Test failed: got 487

=== w7pro64 (32 bit reader) ===
reader.c:5208: Test failed: got 487

=== w8 (32 bit reader) ===
reader.c:5208: Test failed: got 487

=== w864 (32 bit reader) ===
reader.c:5208: Test failed: got 487

=== w7pro64 (64 bit reader) ===
reader.c:5208: Test failed: got 487

=== w864 (64 bit reader) ===
reader.c:5208: Test failed: got 487