MMAP: st_ctime and st_mtime not updating properly during test

[cocobean]

During open_posix_testsuite 14-1, the st_ctime and st_mtime fields of a file that is mapped with MAP_SHARED and PROT_WRITE shall be marked for update at some point in the interval between a write reference to the mapped region and the next call to msync() with MS_ASYNC or MS_SYNC for that portion of the file by any process. If there is no such call and if the underlying file is modified as a result of a write reference, then these fields shall be marked for update at some time after the write reference. The test is failing on Haiku R1B2 x86 (+123).

Ref: ​https://github.com/haiku/open_posix_testsuite/blob/master/conformance/interfaces/mmap/14-1.c