Edric Milaret authored Mar 21, 2016 and Guillaume Roguez committed Mar 22, 2016

PJ_SIP defines WIN32_LEAN_AND_MEAN since 3876.
If we not force it to 1, this causes lot of redefinition
warning at build.

Change-Id: If72f0260bf15ce002cd922b875a0e816c6eb3ea2
Tuleap: #487