Auto plugin extension for multiplatform support.

Now plugin extension must be added to filename:

PluginLoader.setFileName( "myPlugin.dll" );

But for multiplatform application I'd rather omit extension here:

PluginLoader.setFileName( "myPlugin" );

to let system add proper .dll, .so or .dylib by itself. Now I need do some actions if I create multiplatformed app.

I suggest create overloaded setFileName() in future versions of Qt. It will have one additional parameter:

PluginLoader::setFileName( const char* filename, bool autoextension );

if autoextension == true then assumed filename doesn't have extension and it is added by this function depending from system

then I'll just call

PluginLoader.setFileName( "myPlugin", true );

and will be happy in all host OSes...

call to
PluginLoader.setFileName( "myPlugin.dll", false );
will be the same as
PluginLoader.setFileName( "myPlugin.dll" );