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FFI: Fix pragma push stack limit check and throw on overflow.

Reported by Sergey Kaplun.

(cherry-picked from commit 433d7e8d8)

`cp->packstack` is the array of size `CPARSE_MAX_PACKSTACK` (7). Before
the patch, `cp->curpack` is checked to be less than
`CPARSE_MAX_PACKSTACK`, but then `cp->packstack` is accessed at
`cp->curpack + 1`, which is out of bounds, so `cp->curpack` value is
overwritten.

This patch fixes a condition and also adds the error throw when counter
is overflow (instead of rewriting a top `cp->packstack` value).

Sergey Kaplun:
* added the description and the test for the problem

Resolves tarantool/tarantool#9339
Part of tarantool/tarantool#9145

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