mavlink: cmake generate mavlink headers at build time

- mavlink/mavlink is now directly included as a submodule instead of the generated mavlink/c_library_v2
 - this also switches to mavlink development.xml by default

src/modules/mavlink/mavlink_tests/CMakeLists.txt

@@ -31,12 +31,13 @@
 #
 ############################################################################
 
-include_directories(${PX4_SOURCE_DIR}/mavlink/include/mavlink)
-
 px4_add_module(
 	MODULE modules__mavlink__mavlink_tests
 	MAIN mavlink_tests
 	STACK_MAIN 8192
+	INCLUDES
+		${CMAKE_BINARY_DIR}/mavlink
+		${CMAKE_BINARY_DIR}/mavlink/common
 	COMPILE_FLAGS
 		-DMAVLINK_FTP_UNIT_TEST
 		#-DMAVLINK_FTP_DEBUG

src/modules/mavlink/mavlink_tests/mavlink_ftp_test.h

@@ -40,7 +40,7 @@
 #ifndef MAVLINK_FTP_UNIT_TEST
 #include "../mavlink_bridge_header.h"
 #else
-#include <v2.0/standard/mavlink.h>
+#include <mavlink.h>
 #endif
 #include "../mavlink_ftp.h"