package{protobuf,python-protobuf}: bump to v3.2.0

package{protobuf,python-protobuf}: bump to v3.2.0

Both packages are coupled, so both are bumped and build-tested.

The atomics' support patch is no longer needed, and neither is the
autoreconf option, and SPARC64 is no longer broken.

To make sure of this, one config of each of the following archs was
tested (base defconfig in parens):

 - PowerPC (qemu_ppc_g3beige_defconfig)
 - SPARC (qemu_sparc_ss10_defconfig)
 - SPARC64 (qemu_sparc64_sun4u_defconfig)

Signed-off-by: Mario J. Rugiero <mrugiero@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>