libperf: Do not include non-UAPI linux/compiler.h header

Its just for that __packed define, so use it expanded as __attribute__((packed)),
like the other files in /usr/include do.

This was problem was preventing building the libperf examples on ALT
Linux and Fedora 35, fix it.

Reported-by: Vitaly Chikunov <[e-mail]>
Acked-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Dmitry Levin <[e-mail]
Cc: Ian Rogers <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/lib/perf/include/perf/event.h

···
 #include <linux/types.h>
 #include <linux/limits.h>
 #include <linux/bpf.h>
-#include <linux/compiler.h>
 #include <sys/types.h> /* pid_t */
 
 #define event_contains(obj, mem) ((obj).header.size > offsetof(typeof(obj), mem))
···
 	__u16 end_cpu;
 };
 
-struct __packed perf_record_cpu_map_data {
+struct perf_record_cpu_map_data {
 	__u16			 type;
 	union {
 		/* Used when type == PERF_CPU_MAP__CPUS. */
···
 		/* Used when type == PERF_CPU_MAP__RANGE_CPUS. */
 		struct perf_record_range_cpu_map range_cpu_data;
 	};
-};
+} __attribute__((packed));
 
 #pragma GCC diagnostic pop