In WT-5130 a new macro was introduced to use mmap. The code restructuring introduced the use of WT_RET_MSG. That has introduced the printing of "error" messages in 4.4 that were not printed in 4.2 as the wt_posix_extend_file function tries the various ways to extend the file and sometimes getting ENOTSUP.

This ticket should eliminate that use and either just use WT_RET or use WT_RET only on ENOTSUP or something else, but we should avoid printing an error message in the common case.