perl/Makefile: install Git::I18N under NO_PERL_MAKEMAKER

When I added the i18n infrastructure in v1.7.8-rc2-1-g5e9637c I forgot
to install Git::I18N also when NO_PERL_MAKEMAKER=YesPlease was
set. Change the generation of the fallback perl.mak file to do that.

Now Git/I18N.pm is installed alongside Git.pm in such a way that
anything that uses GITPERLLIB will find it.

Reported-by: Tom G. Christensen <tgc@statsbiblioteket.dk>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

perl/Makefile

@@ -23,15 +23,18 @@ clean:
 ifdef NO_PERL_MAKEMAKER
 instdir_SQ = $(subst ','\'',$(prefix)/lib)
 $(makfile): ../GIT-CFLAGS Makefile
-	echo all: private-Error.pm Git.pm > $@
-	echo '	mkdir -p blib/lib' >> $@
+	echo all: private-Error.pm Git.pm Git/I18N.pm > $@
+	echo '	mkdir -p blib/lib/Git' >> $@
 	echo '	$(RM) blib/lib/Git.pm; cp Git.pm blib/lib/' >> $@
+	echo '	$(RM) blib/lib/Git/I18N.pm; cp Git/I18N.pm blib/lib/Git/' >> $@
 	echo '	$(RM) blib/lib/Error.pm' >> $@
 	'$(PERL_PATH_SQ)' -MError -e 'exit($$Error::VERSION < 0.15009)' || \
 	echo '	cp private-Error.pm blib/lib/Error.pm' >> $@
 	echo install: >> $@
 	echo '	mkdir -p "$$(DESTDIR)$(instdir_SQ)"' >> $@
+	echo '	mkdir -p "$$(DESTDIR)$(instdir_SQ)/Git"' >> $@
 	echo '	$(RM) "$$(DESTDIR)$(instdir_SQ)/Git.pm"; cp Git.pm "$$(DESTDIR)$(instdir_SQ)"' >> $@
+	echo '	$(RM) "$$(DESTDIR)$(instdir_SQ)/Git/I18N.pm"; cp Git/I18N.pm "$$(DESTDIR)$(instdir_SQ)/Git"' >> $@
 	echo '	$(RM) "$$(DESTDIR)$(instdir_SQ)/Error.pm"' >> $@
 	'$(PERL_PATH_SQ)' -MError -e 'exit($$Error::VERSION < 0.15009)' || \
 	echo '	cp private-Error.pm "$$(DESTDIR)$(instdir_SQ)/Error.pm"' >> $@