Support for building more modules with Linux

Added more queue support to linux/px4_layer.

Use virt char devices for ms5611, and mavlink.

Added more HRT functionality. uORB latency test
now fails. Likely due to bad HRT impl for Linux.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/drivers/device/ringbuffer.h

@@ -503,7 +503,7 @@ RingBuffer::resize(unsigned new_size)
 void
 RingBuffer::print_info(const char *name) 
 {
-	printf("%s	%u/%u (%u/%u @ %p)\n",
+	printf("%s	%u/%lu (%u/%u @ %p)\n",
 	       name, 
 	       _num_items, 
 	       _num_items * _item_size,