ITS#7878 Replace uint32_t with unsigned in back-mdb
init.c: align mi_dbenv_flags and flags with mdb_dbi_open, which declares flags as unsigned int. search.c: align mi_rtxn_size with ARG_UINT; adjust ww_ctx.nentries to silence a warning about signed/unsigned comparison. config.c: parse checkpoint config more carefully. Reject negative or unreasonably large values for kbytes and minutes. Ensure both values are parsed successfully before making any changes. Fixes a compilation failure under MinGW, where stdint.h types are not implicitly pulled in by other headers.
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