dplayx: Remove unneeded test, fix compilation on msvc++.

[Kai Blin]

The test in EnumConnectionsCallback will always succeed if dpwsockx.dll can be
loaded and contains a TCP/IP service provider, and if TCP/IP networking is
enabled.
It makes no sense to check for all of this in one test, in fact, all 
dpwsockx.dll
tests should go into dpwsockx.

Also, the INITGUID define is needed on msvc++/dxsdk to compile this.
---
 dlls/dplayx/tests/dplayx.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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