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test: fix LuaJIT-tests for old libc version

The `strtod parsing` subtest in the <lib/base/tonumber_scan.lua> checks
the results yielded by the `strtod()` via FFI call. In GLibc versions
before 2.19 it returns an incorrect result for "0x1p-2075" [1]. This
patch skips this test for a smaller version of the libc installed.

[1]: https://sourceware.org/bugzilla/show_bug.cgi?id=16151

Reviewed-by: Maxim Kokryashkin <m.kokryashkin@tarantool.org>
Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>

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