sysif: add overflow checks.

* sysif.c (excec_wrap): Check that our nargs manipulation
doesn't exceed INT_MAX. Use chk_xalloc to allocate the
argument vector, providing an overflow check. Use self
variable in place function name embedded in literal.
(getgroups_wrap): Use chk_xalloc instead of chk_malloc,
so multiplication overflow is checked. Use self variable
in place function name embedded in literal.
(setgroups_wrap): Revamp existing overflow check. Use
ucnum for the size, check that it can convert to size_t
and back without loss of value, and use chk_xalloc
instead of chk_malloc.

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