NuttX build in place

- cmake NuttX build wrapper compile in place instead of copying source tree to build directory
    - slightly faster skipping necessary copying (depending on system)
    - allows debugging in place
    - easier to work directly in NuttX following official documentation
    - simplifies overall build which should make it easier to resolve any remaining NuttX dependency issues in the build system
 - the downside is switching back and forth between different builds always require rebuilding NuttX, but I think this is worth the improved developer experience
 - also no longer builds px4io and bootloader in every single build, for most users these rarely change and we're wasting a lot of build time

cmake/bloaty.cmake

@@ -80,7 +80,7 @@ if (BLOATY_PROGRAM)
 
 	# bloaty compare with last master build
 	add_custom_target(bloaty_compare_master
-		COMMAND wget -c -N --no-verbose https://s3.amazonaws.com/px4-travis/Firmware/master/${PX4_BOARD_VENDOR}_${PX4_BOARD_MODEL}_${PX4_BOARD_LABEL}.elf -O master.elf
+		COMMAND wget --continue --no-verbose https://s3.amazonaws.com/px4-travis/Firmware/master/${PX4_BOARD_VENDOR}_${PX4_BOARD_MODEL}_${PX4_BOARD_LABEL}.elf -O master.elf
 		COMMAND ${BLOATY_PROGRAM} -d symbols ${BLOATY_OPTS} $<TARGET_FILE:px4> -- master.elf
 		DEPENDS px4
 		WORKING_DIRECTORY ${PX4_BINARY_DIR}

cmake/kconfig.cmake

@@ -258,16 +258,6 @@ if(EXISTS ${BOARD_DEFCONFIG})
 	if(ROMFSROOT)
 		set(config_romfs_root ${ROMFSROOT} CACHE INTERNAL "ROMFS root" FORCE)
 
-		if(BUILD_BOOTLOADER)
-			set(config_build_bootloader "1" CACHE INTERNAL "build bootloader" FORCE)
-		endif()
-
-		# IO board (placed in ROMFS)
-		if(IO)
-			set(config_io_board ${IO} CACHE INTERNAL "IO" FORCE)
-			add_definitions(-DBOARD_WITH_IO)
-		endif()
-
 		if(UAVCAN_PERIPHERALS)
 			set(config_uavcan_peripheral_firmware ${UAVCAN_PERIPHERALS} CACHE INTERNAL "UAVCAN peripheral firmware" FORCE)
 		endif()