Cleanup unused lambda captures

Author: layus

vm/boostenv/main/boostenv.hh

@@ -164,7 +164,7 @@ UnstableNode BoostEnvironment::listVMs(VM vm) {
 
 void BoostEnvironment::killVM(VMIdentifier identifier, nativeint exitCode,
                               const std::string& reason) {
-  postVMEvent(identifier, [this, exitCode, reason] (BoostVM& targetVM) {
+  postVMEvent(identifier, [exitCode, reason] (BoostVM& targetVM) {
     targetVM.requestTermination(exitCode, reason);
   });
 }

vm/vm/main/unpickler.cc

@@ -287,7 +287,7 @@ class Unpickler {
         gnode->protocol.init(vm, "immval");
         return result;
       },
-      [this] () {
+      [] () {
       }
     );
   }