[3/8] webservices: Add a stub implementation of WsGetXmlAttribute.

[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=17566

Your paranoid android.


=== w7u (32 bit reader) ===
reader.c:1329: Test failed: wrong data L"valueest"

=== w864 (32 bit reader) ===
reader.c:1329: Test failed: wrong data L"valueD\5868D"

=== w1064 (32 bit reader) ===
reader.c:1329: Test failed: wrong data L"valueo\c5d8o\2980o\2980o\2980o\26b8o\2980o\2980o\2980o\2980o\2980o\26b8o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\2980o\26b8o\5ee6\5456\8e4e"

=== w7pro64 (64 bit reader) ===
reader.c:1329: Test failed: wrong data L"valueb"

=== w864 (64 bit reader) ===
reader.c:1329: Test failed: wrong data L"valueT"

=== w1064 (64 bit reader) ===
reader.c:1329: Test failed: wrong data L"value'"