Log Message:
ham/xlog: Update to 2.0.20

pkgsrc changes:
  - drop workaround for upstream bug fixed in this release
  - rename patchfile per pkglint

- Changes for xlog version 2.0.20 - 2021-jan-30
  * Updated cty.dat 20210127 (cty-3102)
  * Added FST4 support and 5m/8m bands for ADIF 3.1.1
  * Added /dev/ttyUSB0 and /dev/ttyUSB1 to the hamlib device menu
  * Logeditor can hide TX(RST) and RX (RST) (useful for VHF contests)
  * ADIF exports Distance and Azimuth correctly if enabled in Logeditor
  * Imports ADIF from wsjt-x on UDP port 2333
  * Fixed use-after-free error discovered by Chris K2CR and valgrind
  * Fixed hash-table != null assert in dxcc.c
  * Fixed GLib-GObject-WARNING in log.c
  * Compiles cleanly with hamlib4 on ubuntu 18.04 and 20.04