perf tools: Do not provide dup sched_getcpu() prototype on Android

The Bionic libc has this definition, so don't duplicate it.

Cc: Adrian Hunter <[e-mail]>
Cc: Chris Phlipot <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Wang Nan <[e-mail]>
Link: http://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/util.h

···
 		  size_t bytes_per_line, print_binary_t printer,
 		  void *extra);
 
-#ifndef __GLIBC__
+#if !defined(__GLIBC__) && !defined(__ANDROID__)
 extern int sched_getcpu(void);
 #endif