mshtml/tests: Use lstrcmpA in a helper function to make it work correctly on Win98.

dlls/mshtml/tests/dom.c

@@ -374,9 +374,9 @@ static const char *dbgstr_guid(REFIID riid)
 
 static int strcmp_wa(LPCWSTR strw, const char *stra)
 {
-    WCHAR buf[512];
-    MultiByteToWideChar(CP_ACP, 0, stra, -1, buf, sizeof(buf)/sizeof(WCHAR));
-    return lstrcmpW(strw, buf);
+    CHAR buf[512];
+    WideCharToMultiByte(CP_ACP, 0, strw, -1, buf, sizeof(buf), NULL, NULL);
+    return lstrcmpA(stra, buf);
 }
 
 static BSTR a2bstr(const char *str)