buildroot

package/ccache: bump to version 3.2.1

Bump ccache from v.3.1.x to v.3.2.x.
All functionality remained the same.
 - Configure now accepts a parameter to use ccache's internal zlib.
 - conf.c was introduced and some settings were moved from ccache.c,
   with minor changes.
 - The PATCH_CONFIGURATION hook was moved from POST_CONFIGURE to
   POST_PATCH, as patching files should be done there, before calling
   the configure script.

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