perf/compat: Fill in new definitions for madvise()/mmap() flags

[Ingo Molnar]

builtin-trace.c started using various new syscall features not defined in 
the header files of older distros - resulting in build failures.

Fill in the (ABI) constants if they are not defined.

(There might be a better place to put this than builtin-trace.c, into a 
compat header or so.)

Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index f5aa637..e640e28 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -16,6 +16,23 @@
 #include <sys/mman.h>
 #include <linux/futex.h>
 
+/* For older distros: */
+#ifndef MAP_STACK
+# define MAP_STACK		0x20000
+#endif
+
+#ifndef MADV_HWPOISON
+# define MADV_HWPOISON		100
+#endif
+
+#ifndef MADV_MERGEABLE
+# define MADV_MERGEABLE		12
+#endif
+
+#ifndef MADV_UNMERGEABLE
+# define MADV_UNMERGEABLE	13 
+#endif
+
 static size_t syscall_arg__scnprintf_hex(char *bf, size_t size,
 					 unsigned long arg,
 					 u8 arg_idx __maybe_unused,
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