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sysprof: fix crash during FFUNC stream

Sometimes, the Lua stack can be inconsistent during
the FFUNC execution, which may lead to a sysprof
crash during the stack unwinding.

This patch replaces the `top_frame` property of `global_State`
with `lj_sysprof_topframe` structure, which contains `top_frame`
and `ffid` properties. `ffid` property makes sense only when the
LuaJIT VM state is set to `FFUNC`. That property is set to the
ffid of the fast function that VM is about to execute.
In the same time, `top_frame` property is not updated now, so
the top frame of the Lua stack can be streamed based on the ffid,
and the rest of the Lua stack can be streamed as usual.

Also, this patch fixes the build via Makefile.original by adding
the `LJ_HASSYSPROF` flag support to it.

Resolves tarantool/tarantool#8594

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