[PATCH 3/6] Doc: drop support for docbook-xsl before 1.73.0

["Martin Ågren" <martin.agren@gmail.com>]

Drop the DOCBOOK_XSL_172 config knob, which was needed with docbook-xsl
1.72 (but neither 1.71 nor 1.73). Version 1.73.0 is more than twelve
years old.

Together with the last few commits, we are now at a point where we don't
have any Makefile knobs to cater to old/broken versions of docbook-xsl.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 Documentation/Makefile           | 10 ----------
 Documentation/manpage-1.72.xsl   | 14 --------------
 Documentation/manpage-normal.xsl |  3 +--
 Makefile                         |  3 ---
 INSTALL                          |  5 ++---
 5 files changed, 3 insertions(+), 32 deletions(-)
 delete mode 100644 Documentation/manpage-1.72.xsl

diff --git a/Documentation/Makefile b/Documentation/Makefile
index c7a8fc99cf..e235c54344 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -149,16 +149,6 @@ endif
 -include ../config.mak.autogen
 -include ../config.mak
 
-#
-# For docbook-xsl ...
-#	-1.71.1,	not supported
-#	1.72.0,		set DOCBOOK_XSL_172.
-#	1.73.0-,	no extra settings are needed
-#
-
-ifdef DOCBOOK_XSL_172
-MANPAGE_XSL = manpage-1.72.xsl
-endif
 ifndef NO_MAN_BOLD_LITERAL
 XMLTO_EXTRA += -m manpage-bold-literal.xsl
 endif
diff --git a/Documentation/manpage-1.72.xsl b/Documentation/manpage-1.72.xsl
deleted file mode 100644
index b4d315cb8c..0000000000
--- a/Documentation/manpage-1.72.xsl
+++ /dev/null
@@ -1,14 +0,0 @@
-<!-- manpage-1.72.xsl:
-     special settings for manpages rendered from asciidoc+docbook
-     handles peculiarities in docbook-xsl 1.72.0 -->
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-		version="1.0">
-
-<xsl:import href="manpage-base.xsl"/>
-
-<!-- these are the special values for the roff control characters
-     needed for docbook-xsl 1.72.0 -->
-<xsl:param name="git.docbook.backslash">&#x2593;</xsl:param>
-<xsl:param name="git.docbook.dot"      >&#x2302;</xsl:param>
-
-</xsl:stylesheet>
diff --git a/Documentation/manpage-normal.xsl b/Documentation/manpage-normal.xsl
index a48f5b11f3..c9c68a0542 100644
--- a/Documentation/manpage-normal.xsl
+++ b/Documentation/manpage-normal.xsl
@@ -1,6 +1,5 @@
 <!-- manpage-normal.xsl:
-     special settings for manpages rendered from asciidoc+docbook
-     handles anything we want to keep away from docbook-xsl 1.72.0 -->
+     special settings for manpages rendered from asciidoc+docbook -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 		version="1.0">
 
diff --git a/Makefile b/Makefile
index 0e0a6badc1..b596691a12 100644
--- a/Makefile
+++ b/Makefile
@@ -282,9 +282,6 @@ all::
 # Define NO_ST_BLOCKS_IN_STRUCT_STAT if your platform does not have st_blocks
 # field that counts the on-disk footprint in 512-byte blocks.
 #
-# Define DOCBOOK_XSL_172 if you want to format man pages with DocBook XSL v1.72
-# (not v1.73 or v1.71).
-#
 # Define GNU_ROFF if your target system uses GNU groff.  This forces
 # apostrophes to be ASCII so that cut&pasting examples to the shell
 # will work.
diff --git a/INSTALL b/INSTALL
index 07a283fcf2..b244949615 100644
--- a/INSTALL
+++ b/INSTALL
@@ -206,9 +206,8 @@ Issues of note:
    clone two separate git-htmldocs and git-manpages repositories next
    to the clone of git itself.
 
-   The minimum supported version of docbook-xsl is 1.72.
-   It has been reported that docbook-xsl version 1.72 and 1.73 are
-   buggy; 1.72 misformats manual pages for callouts, and 1.73 needs
+   The minimum supported version of docbook-xsl is 1.73.
+   It has been reported that docbook-xsl version 1.73 is buggy; it needs
    the patch in contrib/patches/docbook-xsl-manpages-charmap.patch
 
    Users attempting to build the documentation on Cygwin may need to ensure
-- 
2.26.0