games/pysolfc: Fix runtime issues with Python 3.8+

• The deprecated function "time.clock()" has been removed in Python 3.8 and "time.perf_counter()" should be used instead.
  
  Because updating to a newer version of PySolFC requires a bit more work, use a backport for now to remedy the runtime issues.

• Bump PORTREVISION due changed package contents.

PR: 256504
Reported by: <sven.a.jonsson@bahnhof.se>
MFH: 2021Q2

(cherry picked from commit 91cf30435554dda6bf71dc566f91352dd469d816)