Doc: drop support for docbook-xsl before 1.72.0

docbook-xsl 1.72.0 is thirteen years old. Drop the ASCIIDOC_ROFF knob
which was needed to support 1.68.1 - 1.71.1. The next commit will
increase the required/assumed version further.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/Makefile

@@ -151,21 +151,13 @@ endif
 
 #
 # For docbook-xsl ...
-#	-1.71.0,	not supported
-#	1.71.1,		set ASCIIDOC_ROFF?
+#	-1.71.1,	not supported
 #	1.72.0,		set DOCBOOK_XSL_172.
 #	1.73.0-,	no extra settings are needed
 #
 
 ifdef DOCBOOK_XSL_172
-ASCIIDOC_EXTRA += -a git-asciidoc-no-roff
 MANPAGE_XSL = manpage-1.72.xsl
-else
-	ifndef ASCIIDOC_ROFF
-	# docbook-xsl after 1.72 needs the regular XSL, but will not
-	# pass-thru raw roff codes from asciidoc.conf, so turn them off.
-	ASCIIDOC_EXTRA += -a git-asciidoc-no-roff
-	endif
 endif
 ifndef NO_MAN_BOLD_LITERAL
 XMLTO_EXTRA += -m manpage-bold-literal.xsl

Documentation/asciidoc.conf

@@ -31,24 +31,6 @@ ifdef::backend-docbook[]
 endif::backend-docbook[]
 
 ifdef::backend-docbook[]
-ifndef::git-asciidoc-no-roff[]
-# "unbreak" docbook-xsl v1.68 for manpages. v1.69 works with or without this.
-# v1.72 breaks with this because it replaces dots not in roff requests.
-[listingblock]
-<example><title>{title}</title>
-<literallayout class="monospaced">
-ifdef::doctype-manpage[]
-&#10;.ft C&#10;
-endif::doctype-manpage[]
-|
-ifdef::doctype-manpage[]
-&#10;.ft&#10;
-endif::doctype-manpage[]
-</literallayout>
-{title#}</example>
-endif::git-asciidoc-no-roff[]
-
-ifdef::git-asciidoc-no-roff[]
 ifdef::doctype-manpage[]
 # The following two small workarounds insert a simple paragraph after screen
 [listingblock]
@@ -67,7 +49,6 @@ ifdef::doctype-manpage[]
 {title#}</para></formalpara>
 {title%}<simpara></simpara>
 endif::doctype-manpage[]
-endif::git-asciidoc-no-roff[]
 endif::backend-docbook[]
 
 ifdef::doctype-manpage[]

INSTALL

@@ -206,7 +206,7 @@ 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 1.71.1.
+   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 patch in contrib/patches/docbook-xsl-manpages-charmap.patch

Makefile

@@ -285,9 +285,6 @@ all::
 # Define DOCBOOK_XSL_172 if you want to format man pages with DocBook XSL v1.72
 # (not v1.73 or v1.71).
 #
-# Define ASCIIDOC_ROFF if your DocBook XSL does not escape raw roff directives
-# (versions 1.68.1 through v1.72).
-#
 # 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.