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test: harden skipcond for libc in LuaJIT-tests

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 2.28 it returns an incorrect result (NaN instead of inf) for
"0x3p1023" [1]. This patch hardens the skipcond for this test for an
older version of the libc installed.

[1]: https://sourceware.org/bugzilla/show_bug.cgi?id=23279

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