msxml3: complain louder if libxslt was missing at compile time

[Austin English]

For cases like https://bugs.winehq.org/show_bug.cgi?id=10686

-- 
-Austin
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diff --git a/dlls/msxml3/node.c b/dlls/msxml3/node.c
index b49f46c..60ec9c3 100644
--- a/dlls/msxml3/node.c
+++ b/dlls/msxml3/node.c
@@ -54,6 +54,7 @@
 #include "wine/debug.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(msxml);
+WINE_DECLARE_DEBUG_CHANNEL(winediag);
 
 #ifdef HAVE_LIBXML2
 
@@ -1308,7 +1309,7 @@ HRESULT node_transform_node_params(const xmlnode *This, IXMLDOMNode *stylesheet,
 
     return hr;
 #else
-    FIXME("libxslt headers were not found at compile time\n");
+    ERR_(winediag)("libxslt headers were not found at compile time. This is not supported, expect problems!\n");
     return E_NOTIMPL;
 #endif
 }