[PATCH v1] perf trace: Avoid compile error wrt redefining bool

[Ian Rogers <irogers@xxxxxxxxxx>]

Make part of an existing TODO conditional to avoid the following build
error:
```
tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c:26:14: error: cannot combine with previous 'char' declaration specifier
   26 | typedef char bool;
      |              ^
include/stdbool.h:20:14: note: expanded from macro 'bool'
   20 | #define bool _Bool
      |              ^
tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c:26:1: error: typedef requires a name [-Werror,-Wmissing-declarations]
   26 | typedef char bool;
      | ^~~~~~~~~~~~~~~~~
2 errors generated.
```

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
index 90ce22f9c1a9..939ec769bf4a 100644
--- a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
+++ b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
@@ -23,7 +23,9 @@
 #define MAX_CPUS  4096
 
 // FIXME: These should come from system headers
+#ifndef bool
 typedef char bool;
+#endif
 typedef int pid_t;
 typedef long long int __s64;
 typedef __s64 time64_t;
-- 
2.42.0.283.g2d96d420d3-goog