bpftool, musl compat: Replace sys/fcntl.h by fcntl.h

musl does not like including sys/fcntl.h directly:

    [...]
    1 | #warning redirecting incorrect #include <sys/fcntl.h> to <fcntl.h>
    [...]
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20220424051022.2619648-5-asmadeus@codewreck.org

tools/bpf/bpftool/tracelog.c

@@ -9,7 +9,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <linux/magic.h>
-#include <sys/fcntl.h>
+#include <fcntl.h>
 #include <sys/vfs.h>
 
 #include "main.h"