astro/pyephem: Add missing (ephem) dependency

The 3.7.7.0 release of pyephem was converted [1] into a stub, depending on
the ephem package, in order to allow software authors to transition to the
new package name.

The ports r511276 commit updating the port to 3.7.7.0 missed the additional
dependency.

This change adds the missing dependency, after astro/py-ephem landed as a
new port in ports r520162, and unbreaks all current astro/pyephem
dependents, and all transitive dependents, including comms/gnuradio [2].

While I'm here:

  - Add NO_ARCH
  - Bump PORTREVISION given this issue did not affect builds, just runtime
    and dependents accordingly.

[1] https://github.com/brandon-rhodes/pyephem/commit/5c32679a8650efd2e79d5f794edd1587b3b6e67b
[2] bug 240546

PR:		240735
Submitted by:	Rainer Hurling <rhurlin gwdg de>
Approved by:	portmgr (blanket(s): missing dependencies, build/run fix (dependents))
MFH:		2019Q4 (MFH with r520162)

0 files changed, 0 insertions, 0 deletions