buildroot

ccache: fix the indentation

Commit "packages: indentation cleanup" broke the build of master.
This commit reverse the patch on just ccache package and fix that issue.

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>