tools: do not build bc documentation (#13841)

Building the "bc" documentation requires the "makeinfo" program to be
installed on the host.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 37209

tools/bc/patches/001-no_doc.patch

+diff -urN bc-1.06.95/Makefile.am bc-1.06.95.new/Makefile.am
+--- bc-1.06.95/Makefile.am	2005-05-27 01:05:41.000000000 +0100
++++ bc-1.06.95.new/Makefile.am	2013-07-09 09:33:31.521490710 +0100
+@@ -1,6 +1,6 @@
+ ## Process this file with automake to produce Makefile.in
+ 
+-SUBDIRS = lib bc dc doc
++SUBDIRS = lib bc dc
+ 
+ MAINTAINERCLEANFILES =  aclocal.m4 config.h.in configure Makefile.in \
+ 			stamp-h $(distdir).tar.gz h/number.h depcomp missing
+diff -urN bc-1.06.95/Makefile.in bc-1.06.95.new/Makefile.in
+--- bc-1.06.95/Makefile.in	2006-09-05 03:39:30.000000000 +0100
++++ bc-1.06.95.new/Makefile.in	2013-07-09 09:33:28.565490767 +0100
+@@ -149,7 +149,7 @@
+ sharedstatedir = @sharedstatedir@
+ sysconfdir = @sysconfdir@
+ target_alias = @target_alias@
+-SUBDIRS = lib bc dc doc
++SUBDIRS = lib bc dc
+ MAINTAINERCLEANFILES = aclocal.m4 config.h.in configure Makefile.in \
+ 			stamp-h $(distdir).tar.gz h/number.h depcomp missing
+