fixes elem_size for default memcmp-based compare function not robust against reallocations

fix outdated names of the cx_ccmp functions + adds first tests for using cx_compare_func2

fix cxSetAdvancedCompareFunc() setting the wrong custom data field

check-all.sh now also works when nothing has been configured so far

let check-all.sh restore the build tree when it's done

add tmpnam() fallback when in ISO C23 mode - resolves #786

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mercurial