Copter: fix compilation when GUIDED, AUTO and CIRCLE modes are disabled

[tatsuy]

This allows compilation when GUIDED, AUTO and CIRCLE modes are disabled.

I've confirmed that the compilation succeeds when the following combinations are disabled.

• AUTO
• AUTO and CIRCLE
• AUTO and GUIDED
• AUTO, CIRCLE and GUIDED

CIRCLE / GUIDED are dependent on AUTO , so it cannot be disabled independently.

[peterbarker]

Sorry, this needs a rebase.

[tatsuy]

rebased!

[tatsuy]

@peterbarker Could you check this again?

[tatsuy]

rebased

CubeBlack
Target          Text (B)  Data (B)  BSS (B)  Total Flash Used (B)  Free Flash (B)
---------------------------------------------------------------------------------
bin/arducopter   1711600      3476   193360               1715076          365680
bin/arducopter   1693580      3476   193364               1697056          383696 disabled AUTO
bin/arducopter   1690756      3476   193364               1694232          386520 disabled AUTO and CIRCLE
bin/arducopter   1680788      3472   193364               1684260          396504 disabled AUTO and GUIDED
bin/arducopter   1677984      3472   193360               1681456          399312 disabled AUTO, CIRCLE and GUIDED

compared the flash size with disabled FOLLOW, GUIDED_NOGPS and ADSB due to dependencies with Guided mode.

[rmackay9]

Merged, thanks!

[tatsuy]

Thank you!