Allow install of binutils and import texinfo

- Enable installing binutils from the base system.

 - Import texinfo which is required for the binutils tools
   to be compiled.

 - Also adapted the fetch rules to correctly generate the
   gitignore files for gcc, and allow the case of multiple
   modules in the same directory, as found in gnu/dist.

Warning: This patch has an entry in docs/UPDATING

Change-Id: Ib781734e8fd7f9c6265fa65d62ba2cf3fccbc5ba

docs/UPDATING

@@ -1,3 +1,13 @@
+20130711:
+	Texinfo needs itself to generate its manual pages. As it is not
+	yet installed on the system it fails to find the default makeinfo
+	tool. So we have to first compile it, then install it will specifying 
+	the full path to makeinfo (Both commands have to be run, in the given 
+	sequence):
+
+	# make -C gnu/usr.bin/texinfo all
+	# make -C gnu/usr.bin/texinfo all install TOOL_MAKEINFO=/usr/src/gnu/usr.bin/texinfo/makeinfo/makeinfo
+
 20130422:
 	The ARM build no longer requires you to build as root user you
 	therefore need to wipe (or chmod) your build generated files