perf doc: Remove references to user-manual

Perf doesn't have a user-manual.txt, but git does and this explains why
there are references here. Having these references breaks 'make info' as
user-manual.info can't be created given the missing dependency. Remove
all references to user-manual so that 'make info' can succeed.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https //lore.kernel.org/r/20210715013343.2286699-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/Makefile

@@ -186,8 +186,6 @@ man7: $(DOC_MAN7)
 
 info: $(OUTPUT)perf.info $(OUTPUT)perfman.info
 
-pdf: $(OUTPUT)user-manual.pdf
-
 install: install-man
 
 check-man-tools:
@@ -225,11 +223,6 @@ install-info: info
 	  echo "No directory found in $(DESTDIR)$(infodir)" >&2 ; \
 	fi
 
-install-pdf: pdf
-	$(call QUIET_INSTALL, Documentation-pdf) \
-		$(INSTALL) -d -m 755 $(DESTDIR)$(pdfdir); \
-		$(INSTALL) -m 644 $(OUTPUT)user-manual.pdf $(DESTDIR)$(pdfdir)
-
 #install-html: html
 #	'$(SHELL_PATH_SQ)' ./install-webdoc.sh $(DESTDIR)$(htmldir)
 
@@ -304,24 +297,6 @@ $(OUTPUT)%.xml : %.txt
 XSLT = docbook.xsl
 XSLTOPTS = --xinclude --stringparam html.stylesheet docbook-xsl.css
 
-$(OUTPUT)user-manual.html: $(OUTPUT)user-manual.xml
-	$(QUIET_XSLTPROC)xsltproc $(XSLTOPTS) -o $@ $(XSLT) $<
-
-$(OUTPUT)perf.info: $(OUTPUT)user-manual.texi
-	$(QUIET_MAKEINFO)$(MAKEINFO) --no-split -o $@ $(OUTPUT)user-manual.texi
-
-$(OUTPUT)user-manual.texi: $(OUTPUT)user-manual.xml
-	$(QUIET_DB2TEXI)$(RM) $@+ $@ && \
-	$(DOCBOOK2X_TEXI) $(OUTPUT)user-manual.xml --encoding=UTF-8 --to-stdout >$@++ && \
-	$(PERL_PATH) fix-texi.perl <$@++ >$@+ && \
-	rm $@++ && \
-	mv $@+ $@
-
-$(OUTPUT)user-manual.pdf: $(OUTPUT)user-manual.xml
-	$(QUIET_DBLATEX)$(RM) $@+ $@ && \
-	$(DBLATEX) -o $@+ -p /etc/asciidoc/dblatex/asciidoc-dblatex.xsl -s /etc/asciidoc/dblatex/asciidoc-dblatex.sty $< && \
-	mv $@+ $@
-
 $(OUTPUT)perfman.texi: $(MAN_XML) cat-texi.perl
 	$(QUIET_DB2TEXI)$(RM) $@+ $@ && \
 	($(foreach xml,$(MAN_XML),$(DOCBOOK2X_TEXI) --encoding=UTF-8 \