adding op-codes for syscall ipc for shmat/shmdt

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 the #define HAS_SHMDT
evaluate to false so intercept_shmat / intercept_shmdt were
left undefined so shmat/shmdt memory events went unintercepted).

(cherry picked from commit e8fab058dac7300569cb54b08e5500115f8bab8f)
Signed-off-by: Mark Allen <markalle@us.ibm.com>

opal/mca/memory/patcher/memory_patcher_component.c

@@ -15,7 +15,7 @@
  *                         reserved.
  * Copyright (c) 2016-2017 Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
- * Copyright (c) 2016-2019 IBM Corporation.  All rights reserved.
+ * Copyright (c) 2016-2020 IBM Corporation.  All rights reserved.
  *
  * $COPYRIGHT$
  *
@@ -334,6 +334,18 @@ static int intercept_brk (void *addr)
 
 #endif
 
+// 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
+#ifndef IPCOP_shmat
+#define IPCOP_shmat                21
+#endif
+#ifndef IPCOP_shmdt
+#define IPCOP_shmdt                22
+#endif
+
 #define HAS_SHMDT (defined(SYS_shmdt) || \
     (defined(IPCOP_shmdt) && defined(SYS_ipc)))
 #define HAS_SHMAT (defined(SYS_shmat) || \