Sunwait calculates sunrise or sunset times with civil, nautical,
astronomical and custom twilights.
Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
[Thomas:
- add dependency on C++
- improve the build logic to pass cflags/ldflags properly]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>