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Fix command-line argv handling.

(cherry-picked from commit 9ebebc9b5)

Before the patch, there was a situation where `luaL_newstate`
could fail in main and the `argv[0]` could be used as a progname
in `l_message`. However, `argv[0]` is not guaranteed to be
non-NULL, so segmentation fault could occur. This patch fixes the
issue by using the predefined name in that case. Moreover, it
refactors the `l_message`, so now there is no need to pass
`pname` everywhere.

Part of tarantool/tarantool#9145

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