MMAP: Out of Memory error instead of EOVERFLOW result during PTS test

[cocobean]

Open POSIX Test Suite fails MMAP 31-1 test with Out of Memory result instead of expected EOVERFLOW result.

The mmap() function shall fail if:
 [EOVERFLOW] The file is a regular file and the value of off
 plus len exceeds the offset maximum established in the open
 file description associated with fildes.

 Note: This error condition came to the standard with large
       file extension and cannot be triggered without it.

       So in order to trigger this we need 32 bit architecture
       and largefile support turned on

.

Ref: ​https://github.com/haiku/open_posix_testsuite/blob/master/conformance/interfaces/mmap/31-1.c