Increases vivado max threads to 12

common/synthese.vivado.tcl

@@ -2,6 +2,7 @@
 set DEVICE         [lindex $argv 0]
 set TOP            [lindex $argv 1]
 set REP            [lindex $argv 2]
+set_param general.maxThreads 12
 
 #lecture de tous les sv générés
 set files [glob RTL/${REP}.${TOP}/*.sv]