main/vala: upgrade to 0.52.1
Also rebuild everything against 0.52.1. While not strictly necessary, the new vala version introduces many fixes in the codegen and also fixes things like memory leaks. This also prepares us for the 3.14 rebuild.
Also rebuild everything against 0.52.1. While not strictly necessary, the new vala version introduces many fixes in the codegen and also fixes things like memory leaks. This also prepares us for the 3.14 rebuild.