Fix indirect ipc subcall handling

indirect_ipccall used to guess whether currently decoded ipc syscall is
an indirect subcall or not based on generic knowledge, while there is a
robust method to identify indirect ipc subcalls.

* defs.h (TRACE_INDIRECT_SUBCALL): New flag.
* ipc.c (indirect_ipccall): Check it.
* linux/subcall.h: Set it.
3 files changed