These op codes used to be in bits/ipc.h but were removed in glibc in 2015
with a comment saying they should be defined in internal headers:
https://sourceware.org/bugzilla/show_bug.cgi?id=18560
and when glibc uses that syscall it seems to do so from its own definitions:
https://github.com/bminor/glibc/search?q=IPCOP_shmat&unscoped_q=IPCOP_shmat
So I think using #ifndef and defining them if they're not already defined
using the values from glibc is the best option.
At IBM it was the testing on redhat 8 that found this as an issue
(the opcodes being undefined on the system made it select the
left undefined so shmat/shmdt memory events went unintercepted).
Signed-off-by: Mark Allen <markalle@us.ibm.com>
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