buildroot

binutils: fix makeinfo related issue

The latest version of binutils, 2.27, added in commit
b700157db40410907d6a07582eacbb5030fd919e, fails to build on systems
that don't have makeinfo installed. This commit therefore applies the
same fixup as the one used for binutils 2.26, which consists in
touching all the .info files, so that they don't get rebuilt.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>