Added MuORB based on virtual CDev implementation

uORB module now compiles and runs for Linux using the
virtual CDev implementation.

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

src/modules/systemlib/param/param.c

@@ -71,7 +71,7 @@
 /**
  * Array of static parameter info.
  */
-#ifdef _UNIT_TEST
+#if defined(_UNIT_TEST) || defined(__PX4_LINUX)
 	extern struct param_info_s	param_array[];
 	extern struct param_info_s	*param_info_base;
 	extern struct param_info_s	*param_info_limit;

src/modules/uORB/module.mk

@@ -39,8 +39,12 @@ MODULE_COMMAND		= uorb
 
 MODULE_STACKSIZE	= 2048
 
-SRCS			= uORB.cpp \
-			  objects_common.cpp \
+ifeq ($(PX4_TARGET_OS),nuttx)
+SRCS			= uORB.cpp 
+else
+SRCS			= MuORB.cpp 
+endif
+SRCS	+= 		  objects_common.cpp \
 			  Publication.cpp \
 			  Subscription.cpp