doc: remove manpage-base-url workaround

Commit 50d9bbba92 (Documentation: Avoid use of xmlto --stringparam,
2009-12-04) introduced manpage-base-url.xsl because ancient versions of
xmlto did not have --stringparam.

However, that was more than ten years ago, no need for that complexity
anymore, we can just use --stringparam.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Acked-by: Todd Zullinger <tmz@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/.gitignore

@@ -10,7 +10,6 @@ howto-index.txt
 doc.dep
 cmds-*.txt
 mergetools-*.txt
-manpage-base-url.xsl
 SubmittingPatches.txt
 tmp-doc-diff/
 GIT-ASCIIDOCFLAGS

Documentation/Makefile

@@ -189,7 +189,7 @@ endif
 ifndef MAN_BASE_URL
 MAN_BASE_URL = file://$(htmldir)/
 endif
-XMLTO_EXTRA += -m manpage-base-url.xsl
+XMLTO_EXTRA += --stringparam man.base.url.for.relative.links='$(MAN_BASE_URL)'
 
 ifdef USE_ASCIIDOCTOR
 ASCIIDOC = asciidoctor
@@ -331,7 +331,6 @@ clean:
 	$(RM) technical/*.html technical/api-index.txt
 	$(RM) SubmittingPatches.txt
 	$(RM) $(cmds_txt) $(mergetools_txt) *.made
-	$(RM) manpage-base-url.xsl
 	$(RM) GIT-ASCIIDOCFLAGS
 
 $(MAN_HTML): %.html : %.txt $(ASCIIDOC_DEPS)
@@ -340,11 +339,7 @@ $(MAN_HTML): %.html : %.txt $(ASCIIDOC_DEPS)
 $(OBSOLETE_HTML): %.html : %.txto $(ASCIIDOC_DEPS)
 	$(QUIET_ASCIIDOC)$(TXT_TO_HTML) -o $@ $<
 
-manpage-base-url.xsl: manpage-base-url.xsl.in
-	$(QUIET_GEN)sed "s|@@MAN_BASE_URL@@|$(MAN_BASE_URL)|" $< > $@
-
-
-manpage-prereqs := manpage-base-url.xsl $(wildcard manpage*.xsl)
+manpage-prereqs := $(wildcard manpage*.xsl)
 manpage-cmd = $(QUIET_XMLTO)$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
 
 %.1 : %.xml $(manpage-prereqs)

Documentation/manpage-base-url.xsl.in

@@ -1,10 +0,0 @@
-<!-- manpage-base-url.xsl:
-     special settings for manpages rendered from newer docbook -->
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-		version="1.0">
-
-<!-- set a base URL for relative links -->
-<xsl:param name="man.base.url.for.relative.links"
-	>@@MAN_BASE_URL@@</xsl:param>
-
-</xsl:stylesheet>