perf tools: Fix build on non-glibc systems due to libio.h absence

Including libio.h causes build failures on uClibc systems (which lack
libio.h).

It appears that libio.h was only included to pull in a definition for
NULL, so it has been replaced by stddef.h.

On powerpc, libio.h was conditionally included, but could be removed
completely as it is unneeded. Also, the included of stdlib.h was changed
to stddef.h (as again, only NULL is needed).

Signed-off-by: Cody P Schafer <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/arch/arm/util/dwarf-regs.c

···
  * published by the Free Software Foundation.
  */
 
-#include <stdlib.h>
-#ifndef __UCLIBC__
-#include <libio.h>
-#endif
+#include <stddef.h>
 #include <dwarf-regs.h>
 
 struct pt_regs_dwarfnum {

tools/perf/arch/powerpc/util/dwarf-regs.c

···
  * 2 of the License, or (at your option) any later version.
  */
 
-#include <stdlib.h>
-#ifndef __UCLIBC__
-#include <libio.h>
-#endif
+#include <stddef.h>
 #include <dwarf-regs.h>
 
 

tools/perf/arch/s390/util/dwarf-regs.c

···
  *
  */
 
-#include <libio.h>
+#include <stddef.h>
 #include <dwarf-regs.h>
 
 #define NUM_GPRS 16

tools/perf/arch/sh/util/dwarf-regs.c

···
  *
  */
 
-#include <libio.h>
+#include <stddef.h>
 #include <dwarf-regs.h>
 
 /*

tools/perf/arch/sparc/util/dwarf-regs.c

···
  * 2 of the License, or (at your option) any later version.
  */
 
-#include <libio.h>
+#include <stddef.h>
 #include <dwarf-regs.h>
 
 #define SPARC_MAX_REGS	96

tools/perf/arch/x86/util/dwarf-regs.c

···
  *
  */
 
-#include <libio.h>
+#include <stddef.h>
 #include <dwarf-regs.h>
 
 /*