astro/xphoon: Catch up to src bb421be6c117

src bb421be6c117 moved ftime(3) to libutil. This resulted in this
error:

cc -o xphoon -L/usr/local/lib xphoon.o moon.o phase.o dtime.o
-lXext -lX11 -lcompat -lm -Wl,-rpath,/usr/local/lib
ld: error: undefined symbol: ftime

While at it take maintainership of this port.

MFH: 2024Q2