add man7 to subdirs list

The man dir misses the man7 as a subdir which means none of the pages
get installed.

URL: https://bugs.gentoo.org/451166Reported-by: Marcin Mirosław <bug@mejor.pl>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

man/Makefile

@@ -2,7 +2,7 @@ INSTALL=install
 INSTALLDIR=install -m 0755 -d
 INSTALLMAN=install -m 0644
 
-SUBDIRS = man3 man8
+SUBDIRS = man3 man7 man8
 
 all:
 	@for subdir in $(SUBDIRS); do $(MAKE) -C $$subdir; done

man/man7/Makefile

+MAN7PAGES = tc-hfsc.7
+
+all:
+
+distclean: clean
+
+clean:
+
+install:
+	$(INSTALLDIR) $(DESTDIR)$(MANDIR)/man7
+	$(INSTALLMAN) $(MAN7PAGES) $(DESTDIR)$(MANDIR)/man7
+
+.PHONY: install clean distclean