Add usr/share/mk/src.opts.mk to obsolete files. It never should have

been installed in the first place, and it must be removed ASAP or
weird build errors may start happening in the future if this file is
ever taken from the installed system. Add note to UPDATING.

ObsoleteFiles.inc

@@ -38,6 +38,8 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20140505: Bogusly installing src.opts.mk
+OLD_FILES+=usr/share/mk/src.opts.mk
 # 20140505: Reject PR kern/187551
 OLD_DIRS+=usr/tests/sbin/ifconfig
 OLD_FILES+=usr/tests/sbin/ifconfig/Kyuafile

UPDATING

@@ -31,6 +31,11 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 11.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20140508:
+	We bogusly installed src.opts.mk in /usr/share/mk. This file should
+	be removed to avoid issues in the future (and has been added to
+	ObsoleteFiles.inc).
+
 20140505:
 	/etc/src.conf now affects only builds of the FreeBSD src tree. In the
 	past, it affected all builds that used the bsd.*.mk files. The old