Backporting fix to the unrefract bug to 4.9 branch. Right-clicking
below the horizon in Horizontal Coordinates with refraction enabled
would produce wrong results. This patch fixes that.
BUG
Relevant commits on master:
e0207b2b18437109fced83f7b01d28bcdbfa1ca7
9500d513b4759ce24334cbf96e1e0bf0694e0b6b
58bfe5b08b17ca26d36e5317eab5238a536c0058
d0c44248d3f515fb753e7ae8bae79695e26b7653
This feature had been broken for quite some time, so we've decided to
remove it. Due to the big changes at AAVSO site, it might be quite hard
to get it running in the future. Fortunately, we have one person who is
working on it right now.
C11 standard draft as implemented in newer glibc's uses TIME_UTC itself,
so use something else here. See also similar issue in boost: https://svn.boost.org/trac/boost/ticket/6940