package/zmqpp: switch to the official git

The git hash 36413487f05b165dfc82ad307a5a1c36a795e607 no
longer refers to any commit id, even in the previous git tree.

By reading the Makefile and CHANGELOG.md the last know
release is 3.2.0.

Switch to the official git tree and use the 3.2.0 release tag.

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>