doc/Makefile: do not include hg.1.gendoc.txt in MANIFEST

It is an intermediate file used to produce the hg.1 and .hg.1.html
files and is not useful for people who download the tarball. It will
be regenerated automatically by the Makefile if users want to rebuild
the documentation.

doc/Makefile

@@ -1,49 +1,49 b''
 SOURCES=$(wildcard *.[0-9].txt)
 MAN=$(SOURCES:%.txt=%)
 HTML=$(SOURCES:%.txt=%.html)
 GENDOC=gendoc.py ../mercurial/commands.py ../mercurial/help.py ../mercurial/help/*.txt
 PREFIX=/usr/local
 MANDIR=$(PREFIX)/share/man
 INSTALL=install -c -m 644
 PYTHON=python
 
 export LANGUAGE=C
 export LC_ALL=C
 
 all: man html
 
 man: $(MAN)
 
 html: $(HTML)
 
 hg.1.txt: hg.1.gendoc.txt
 	touch hg.1.txt
 
 hg.1.gendoc.txt: $(GENDOC)
 	${PYTHON} gendoc.py > $@.tmp
 	mv $@.tmp $@
 
 %: %.txt common.txt
 	$(PYTHON) runrst hgmanpage --halt warning \
 	  --strip-elements-with-class htmlonly $*.txt $*
 
 %.html: %.txt common.txt
 	$(PYTHON) runrst html --halt warning \
 	  --link-stylesheet --stylesheet-path style.css $*.txt $*.html
 
 MANIFEST: man html
 # tracked files are already in the main MANIFEST
 	$(RM) $@
-	for i in $(MAN) $(HTML) hg.1.gendoc.txt; do \
+	for i in $(MAN) $(HTML); do \
 	  echo "doc/$$i" >> $@ ; \
 	done
 
 install: man
 	for i in $(MAN) ; do \
 	  subdir=`echo $$i | sed -n 's/^.*\.\([0-9]\)$$/man\1/p'` ; \
 	  mkdir -p $(DESTDIR)$(MANDIR)/$$subdir ; \
 	  $(INSTALL) $$i $(DESTDIR)$(MANDIR)/$$subdir ; \
 	done
 
 clean:
 	$(RM) $(MAN) $(HTML) hg.1.gendoc.txt MANIFEST