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Since commit c30d06b7e6 (FindIntl: Add imported target, 2020-10-06,
v3.20.0-rc1~687^2) we use `check_symbol_exists` to check whether the
`intl` library is built in to the C library. On some platforms the
tested symbols are provided as macros so the check passes without
linking any symbol. Instead, check whether a sample source file both
compiles and links.
Fixes: #21979