less: Update misc/less to less-530

Changes:
530
---
* Don't output terminal init sequence if using -F and file fits on one screen.
* When using -S, mark truncated lines with a special character.
  The character can be changed or disabled via the new --rscroll option.
* New command M marks the last line displayed on the screen.
* New command ESC-m removes a line mark.
* Status column (enabled via -J) now shows mark letters.
* Status column shows search matches even if highlighting is disabled via -G.
* A second ESC-u command will clear search match markers in the status column.
* Do same ANSI escape code filtering for tag matching that we do for 
  searching, to help when viewing syntax-highlighted code.
* Catch SIGTERM and clean up before exiting.
* Fix bug initializing default charset on Windows.
* Handle keypad ENTER key correctly if it sends something other than newline.
* Fix buffering bug when using stdin with a LESSOPEN pipe.
* On Windows, allow 'u' in -D option to enable underlining.
* On Windows, use underline in sgr mode.
* On Windows, convert UTF-8 to multibyte if console is not UTF-8.
* Update Unicode tables to 2017-03-08.
* Pass-thru Unicode formating chars (Cf type) instead of treating them
  as binary chars. But treat them as binary if -U is set.
* Fix erroneous binary file warning when UTF-8 file contains ANSI SGR sequences.
* Fix bugs when using LESSOPEN and switching between stdin and other files.
* Fix some bugs handling filenames containing shell metacharacters.
* Fix some memory leaks.
* Allow some debugging environment variables to be set in lesskey file.
* Code improvements:
  - Use ANSI prototypes in funcs.h declarations.
  - Fix some const mismatches.
  - Remove archaic "register" in variable declarations.

487
---
* New commands ESC-{ and ESC-} to shift to start/end of displayed lines.
* Make search highlights work correctly when changing caselessness with -i.
* New option -Da in Windows version to enable SGR mode.
* Fix "nothing to search" error when top or bottom line on screen is empty.
* Fix bug when terminal has no "cm" termcap entry.
* Fix incorrect display when entering double-width chars in search string.
* Fix bug in Unicode handling that missed some double width characters.
* Update Unicode database to 9.0.0.

Index: Makefile
===================================================================
RCS file: /cvsroot/pkgsrc/misc/less/Makefile,v
retrieving revision 1.26
diff -u -p -r1.26 Makefile
--- Makefile	7 Nov 2015 20:18:41 -0000	1.26
+++ Makefile	7 Apr 2018 18:37:08 -0000
@@ -1,6 +1,6 @@
 # $NetBSD: Makefile,v 1.26 2015/11/07 20:18:41 wiz Exp $
 
-DISTNAME=	less-481
+DISTNAME=	less-530
 CATEGORIES=	misc
 MASTER_SITES=	http://www.greenwoodsoftware.com/less/
 
Index: distinfo
===================================================================
RCS file: /cvsroot/pkgsrc/misc/less/distinfo,v
retrieving revision 1.17
diff -u -p -r1.17 distinfo
--- distinfo	7 Nov 2015 20:18:41 -0000	1.17
+++ distinfo	7 Apr 2018 18:37:08 -0000
@@ -1,6 +1,6 @@
 $NetBSD: distinfo,v 1.17 2015/11/07 20:18:41 wiz Exp $
 
-SHA1 (less-481.tar.gz) = 58e7e62a760a9ca3636349de8e3357f7102aea1d
-RMD160 (less-481.tar.gz) = 1454dcb430b49ae9724350d99b9a4e2e50660b7e
-SHA512 (less-481.tar.gz) = 29995757ac416ed6770cf6e82e6fe325bd1d61d51666d80c4fe72b2b4217b0b1d706d337d89ed54bdc4d83d57f3e2c0166e642b20ef2ad194e52aad630b3e717
-Size (less-481.tar.gz) = 316622 bytes
+SHA1 (less-530.tar.gz) = d8ba1f43e88b706ef701f978cd3262b5b44dffd6
+RMD160 (less-530.tar.gz) = 84b4f46be4f93e7a6db3817d43d0bfd1d01d4ff5
+SHA512 (less-530.tar.gz) = 8d83a18b5648c4fe85921a563aa2c40bcf495aeb611098c83cd167b1e2f706649846cdf457c8506ae2683ab362ad970a0b261747349673020894bccdb9acbc10
+Size (less-530.tar.gz) = 339723 bytes