qdoc: allow 'void' function parameter without a parameter name

There are a few functions using a C-style function declaration:

    void foo(void);

meaning that foo() takes no parameters. This change allows this
for QDoc, making it successfully match documented \fn blocks
with the correct declaration, and not print out warnings.

Change-Id: I8191c55094371431b0e9c2ad22d19cadcb7facfb
Reviewed-by: Martin Smith <martin.smith@digia.com>

src/tools/qdoc/generator.cpp

@@ -807,6 +807,7 @@ void Generator::generateBody(const Node *node, CodeMarker *marker)
             QVector<Parameter>::ConstIterator p = func->parameters().constBegin();
             while (p != func->parameters().constEnd()) {
                 if ((*p).name().isEmpty() && (*p).dataType() != QLatin1String("...")
+                        && (*p).dataType() != QLatin1String("void")
                         && func->name() != QLatin1String("operator++")
                         && func->name() != QLatin1String("operator--")) {
                     node->doc().location().warning(tr("Missing parameter name"));