MFC r268576: sh: Correctly handle positional parameters beyond INT_MAX on

MFC r268576: sh: Correctly handle positional parameters beyond INT_MAX on
64-bit systems.

Currently, there can be no more than INT_MAX positional parameters. Make
sure to treat all higher ones as unset to avoid incorrect results and
crashes.

On 64-bit systems, our atoi() takes the low 32 bits of the strtol() and
sign-extends them.

On 32-bit systems, the call to atoi() returned INT_MAX for too high values
and there is not enough address space for so many positional parameters, so
there was no issue.

PR:		195918

git-svn-id: svn://svn.freebsd.org/base/stable/10@275777 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f