doc: add "manual/" directory in its entirety to dist

Change-Id: I750c2938ab207012a6488bf34f55d784e5e26b6e
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/1903
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

doc/Makefile.am

@@ -2,16 +2,9 @@ info_TEXINFOS = openocd.texi
 openocd_TEXINFOS = fdl.texi
 man_MANS = openocd.1
 EXTRA_DIST = openocd.1 \
+	manual \
 	INSTALL.txt
 
-dist-hook:
-	mkdir $(distdir)/manual
-	cp -p $(srcdir)/manual/*.txt $(distdir)/manual
-	for i in $$(cd $(srcdir)/manual/ && ls -d */); do \
-		mkdir $(distdir)/manual/$$i; \
-		cp -p $(srcdir)/manual/$$i/* $(distdir)/manual/$$i/; \
-	done
-
 MAINTAINERCLEANFILES = \
 	$(srcdir)/Makefile.in \
 	$(srcdir)/mdate-sh \