Aix - make statx

[maartenv86]

Please acknowledge the following before creating a ticket

• I have read the GitHub issues section of REPORTING-BUGS.

Description of the bug:
make halts wit the following:

In file included from engines/fileoperations.c:16:
engines/../oslib/statx.h:12:5: error: conflicting types for 'statx'
12 | int statx(int dfd, const char *pathname, int flags, unsigned int mask,
| ^~~~~
In file included from /usr/include/sys/lockf.h:45,
from /opt/freeware/lib/gcc/powerpc-ibm-aix7.2.0.0/10/include-fixed/unistd.h:868,
from /opt/freeware/lib/gcc/powerpc-ibm-aix7.2.0.0/10/include-fixed/fcntl.h:254,
from engines/fileoperations.c:9:
/usr/include/sys/stat.h:512:5: note: previous declaration of 'statx' was here
512 | int statx(char *, struct stat *, int, int);
| ^~~~~
make: *** [Makefile:526: engines/fileoperations.o] Error 1

Environment: AIX 7.2 TL05 SP04

fio version: 3.37

Reproduction steps
./configure <-- without any errors
make <-- halts with above output.

[vincentkfu]

It looks like AIX has a different definition of statx() than Linux does. We need to detect this in configure and make things work.

AIX statx: https://www.ibm.com/docs/en/aix/7.3?topic=s-stat-fstat-lstat-statx-fstatx-statxat-fstatat-fullstat-ffullstat-stat64-fstat64-lstat64-stat64x-fstat64x-lstat64x-stat64xat-subroutine