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build: fix fiber stack size for clang debug asan

There is a limit in Lua parser for too many syntactic levels, but the
stack overflow may come before this limit is reached. This depends on
the fiber stack size and on the code options (compiler, mode, ASAN).

The clang in debug mode with ASAN produces the code which consumes stack
too quick and the overflow triggers before syntactic level limit. So, we
increase the minimal fiber stack size for this configuration from 512Kb
to 1Mb.

See [1] for details.

1. https://github.com/tarantool/security/issues/153

Closes tarantool/security#153

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