lang/gcc-ecj45: Deprecate port

Long time unsupported upstream. Latest version of gcc-ecj is 4.9
(instead of 4.5, tracked by this port) and is from 2013 according to
https://mirrors.kernel.org/sourceware/java/ .

Set expiration date within two weeks: the port has no more reverse
dependencies according to FreshPorts and is very old, there should be no
need to wait much longer before removing it.

PR:		269711
Discussed with:	gerald (maintainer)

lang/gcc-ecj45/Makefile

@@ -11,6 +11,9 @@ COMMENT=	Eclipse Java Compiler used to build GCC Java
 
 LICENSE=	EPL
 
+DEPRECATED=	Long time unsupported upstream, use java/eclipse-ecj instead
+EXPIRATION_DATE=	2023-03-06
+
 NO_BUILD=	yes
 NO_ARCH=	yes
 PLIST_FILES=	share/java/${DISTNAME}