Makeinfo versions greater 5 treat an @itemx that isn't preceeded by an @item
not as warning anymore but as error. The GCC version 4.7.2 that is used by
noux currently triggers this error multiple times. This commit adds a patch
to 'make prepare PKG="gcc"' that avoids the use of @itemx without preceeding
@item. As GCC versions greater than 4.8 should fix this problem by themselves
this should be seen as temporary quick fix.
ref #964