Log Message:
irssi: Update to 1.4.5.

pkgsrc fixes:

 * Remove useless MESSAGE
 * Fold Makefile.common back into Makefile
 * Remove obsolete variables
 * pkglint -Wall cleanup

v1.4.5 2023-10-03  The Irssi team <staff@irssi.org>
	+ Add workaround for Perl 5.38.0 bug that breaks the Irssi
          locale and glyph rendering (scripts.irssi.org#857, #1498)
	- Fix Perl scripts broken by Perl 5.38 (scripts.irssi.org#851,
          #1474). With input from Leon Timmermans
	- Document workaround to fix linker errors when building with
          meson on Apple (#1435, #1492)
	- Fix meson using wrong filenames on Apple, leading to broken
          Perl support (#1483, #1493)
	- Fix /upgrade not accepting `~' (#1460, #1462). By Lukas Mai
	- Improve compatibility with Perl5-IDEA (#1465, #1467). By
          Charlie Daffern
	- Fix logic in how own actions are printed for other protocols
          (codeberg!5, #1471). By Andrej Kacian
	- Fix crash on old PowerPC Mac (#1482, #1484)
	- Fix wrong prototype of library function used in terminal
          handling (#1495). By Emil Engler
	- Minor cleanups (#1488, #1497). Includes work by Emil Engler
	- Minor help and documentation fixes (#1458, #1494, #1477,
          #1478). Includes work by KindOne