Add delete-old and delete-old-libs targets:

  - removes obsolete files/dirs or libraries.
  - works in interactive (default) and batch mode
  - respects DISTDIR
  - documented in UPDATING and build(7)

The head of the file ObsoleteFiles.inc contains instructions how to add
obsolete files/dirs/libs to the list. Obviously one should add obsolete
files to this list, when he removes a file/dir/lib from the basesystem.

Additionally add check-old target:
  - allows re@ to check if a file on the obsolete list resurfaces

Design goals:
  - allows full control by the user (default interactive mode)
  - possibility of scripted removal of obsolete files (batch mode)
  - opt-in removal of files (explicit list of files)
  - seperate removal of libs (2 delete targets)

Important design decissions:
  - structured list of files to remove instead of a plain text file:
    * allows to remove additional files if a NO_foo knob is specified
      without the need to change the targets (no NO_foo knob is respected
      yet)
  - not using mtree like NetBSD does:
    * mtree doesn't has an interactive mode

Discussed on:		arch (long ago), current (this year)
Additional input from:	re (hrs)
Approved by:		mentor (joerg)

1 files changed, 2 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 42db27e..50c8d10 100644
--- a/UPDATING
+++ b/UPDATING
@@ -277,6 +277,7 @@ COMMON ITEMS:
 	<reboot in single user>				[3]
 	mergemaster -p					[5]
 	make installworld
+	make delete-old
 	mergemaster					[4]
 	<reboot>
 
@@ -314,6 +315,7 @@ COMMON ITEMS:
 	<reboot in single user>				[3]
 	mergemaster -p					[5]
 	make installworld
+	make delete-old
 	mergemaster -i					[4]
 	<reboot>