ARC: update folders with patches for arc-2015.06-rc1 release

In buildroot we maintain a couple off-the-tree patches.
In particular for binutils and gcc packages.

Because we have many versions of mentioned packages patches for each
particular version reside in a folder which name matches full version
name of the package.

For example we used to have patches for binutils distributed as part of
arc-2014.12 tools in folder ""package/binutils/arc-2014.12". Now with
bump of ARC tools version we need to rename folder with patches to
"arc-2015.06-rc1".

The same applies to gcc.

Should fix http://autobuild.buildroot.net/results/2b2/2b27a4a64c0b225ae479ecfccf7a97f5ea95598c/


As discussed before it's not possible to reproduce reported problem on recent
Fedora 21/22 distros (at least we know about them) but I may confirm that
patches were applied fine and everything was built well. Hopefully reported
build failure goes away now.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Romain Naour <romain.naour@openwide.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>