Makefile: try to install g++ package explicitly
Makefile: try to install g++ package explicitly

Since executor/gen.go invokes "gcc kvm_gen.cc kvm.S -o kvm_gen", g++ is needed.

  go generate ./pkg/csource ./executor ./pkg/ifuzz ./pkg/build ./pkg/html
  gcc: fatal error: cannot execute ‘cc1plus’: execvp: No such file or directory
  compilation terminated.
  executor/gen.go:6: running "bash": exit status 1

xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller