sather: remove

Dead upstream for about 20 years, has build problems.

As proposed on pkgsrc-users.

Author: 0-wiz-0

doc/CHANGES-2025

@@ -1,4 +1,4 @@
-$NetBSD: CHANGES-2025,v 1.2342 2025/03/26 18:27:50 abs Exp $
+$NetBSD: CHANGES-2025,v 1.2343 2025/03/26 22:51:01 wiz Exp $
 
 Changes to the packages collection and infrastructure in 2025:
 
@@ -3026,3 +3026,4 @@ Changes to the packages collection and infrastructure in 2025:
 	Updated net/yt-dlp to 2025.3.26 [adam 2025-03-26]
 	Removed lang/oo2c [wiz 2025-03-26]
 	Updated mail/exim to 4.98.2 [abs 2025-03-26]
+	Removed lang/sather [wiz 2025-03-26]

lang/Makefile

@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.750 2025/03/26 13:59:49 wiz Exp $
+# $NetBSD: Makefile,v 1.751 2025/03/26 22:51:01 wiz Exp $
 #
 
 COMMENT=	Programming languages
@@ -324,7 +324,6 @@ SUBDIR+=	rust176-bin
 SUBDIR+=	sablevm
 SUBDIR+=	sablevm-classpath
 SUBDIR+=	sablevm-classpath-gui
-SUBDIR+=	sather
 SUBDIR+=	sbcl
 SUBDIR+=	scala
 SUBDIR+=	scala-sbt