coredump: get rid of a bogus assertion

The check looks plausible, but when I started checking whether it needs
to be lowered for the recent changes, I realized that it doesn't make
much sense.

context_parse_iovw() is called from a few places, e.g.:
- process_socket(), where the other side controls the contents of the
  message. We already do other checks on the correctness of the message
  and this assert is not needed.
- gather_pid_metadata_from_argv(), which is called after
  inserting MESSAGE_ID= and PRIORITY= into the array, so there is no
  direct relation between _META_ARGV_MAX and the number of args in the
  iovw.
- gather_pid_metadata_from_procfs(), where we insert a bazillion fields,
  but without any relation to _META_ARGV_MAX.

Since we already separately check if the required stuff was set, drop this
misleading check.

(cherry picked from commit 13902e0)
(cherry picked from commit 4c424072b3cc6a68265345cef2d29a6903081dcf)
(cherry picked from commit e1afd271b5a297873008dcf54d3ce45fe2965984)
(cherry picked from commit 32c4237)

Author: keszybz

src/coredump/coredump.c

@@ -1023,7 +1023,6 @@ static int save_context(Context *context, const struct iovec_wrapper *iovw) {
 
         assert(context);
         assert(iovw);
-        assert(iovw->count >= _META_ARGV_MAX);
 
         /* The context does not allocate any memory on its own */