Remove linux/cycles.h

It's used for get_cycles() implementation, but it's never used.
On certain architectures it gives a warning which is be confusing.

linux/JackLinuxTime.c

@@ -23,7 +23,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 #include "JackTime.h"
 #include "JackTypes.h"
 #include "JackError.h"
-#include "cycles.h"
 
 #include <stdint.h>
 #include <stdio.h>

linux/cycles.h

@@ -1,129 +0,0 @@
-/*
-  Copyright (C) 2001 Paul Davis
-  Code derived from various headers from the Linux kernel
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program; if not, write to the Free Software
-  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-  $Id: cycles.h,v 1.4.2.1 2006/06/20 14:44:00 letz Exp $
-*/
-
-#ifndef __jack_cycles_h__
-#define __jack_cycles_h__
-
-/*
- * Standard way to access the cycle counter on i586+ CPUs.
- * Currently only used on SMP.
- *
- * If you really have a SMP machine with i486 chips or older,
- * compile for that, and this will just always return zero.
- * That's ok, it just means that the nicer scheduling heuristics
- * won't work for you.
- *
- * We only use the low 32 bits, and we'd simply better make sure
- * that we reschedule before that wraps. Scheduling at least every
- * four billion cycles just basically sounds like a good idea,
- * regardless of how fast the machine is.
- */
-
-#ifdef __x86_64__
-
-typedef unsigned long cycles_t;
-extern cycles_t cacheflush_time;
-
-static inline unsigned long get_cycles(void)
-{
-    unsigned int hi, lo;
-    __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
-    return (((unsigned long)hi)<<32) | ((unsigned long)lo);
-}
-
-#endif /* __x86_64__ */
-
-#ifdef __sparc_v9__
-/* rd is V9 only */
-static inline unsigned long long get_cycles(void)
-{
-	unsigned long long res;
-	__asm__ __volatile__("rd %%tick, %0" : "=r"(res));
-	return res;
-}
-#endif /* __sparc_v9__ */
-
-#ifdef __PPC__
-
-/* PowerPC */
-
-#define CPU_FTR_601			0x00000100
-
-typedef unsigned long cycles_t;
-
-/* For the "cycle" counter we use the timebase lower half. */
-
-extern cycles_t cacheflush_time;
-
-static inline cycles_t get_cycles(void)
-{
-    cycles_t ret = 0;
-
-    __asm__ __volatile__(
-        "98:	mftb %0\n"
-        "99:\n"
-        ".section __ftr_fixup,\"a\"\n"
-        "	.long %1\n"
-        "	.long 0\n"
-        "	.long 98b\n"
-        "	.long 99b\n"
-        ".previous"
-    : "=r" (ret) : "i" (CPU_FTR_601));
-    return ret;
-}
-
-#endif /* __PPC__ */
-
-#ifdef __i386__
-
-typedef unsigned long long cycles_t;
-
-extern cycles_t cacheflush_time;
-
-#define rdtscll(val) \
-     __asm__ __volatile__("rdtsc" : "=A" (val))
-
-static inline cycles_t get_cycles (void)
-{
-    unsigned long long ret;
-
-    rdtscll(ret);
-    return ret;
-}
-
-#endif /* __i386__ */
-
-/* everything else but x86, amd64, sparcv9 or ppc */
-#if !defined (__PPC__) && !defined (__x86_64__) && !defined (__i386__) && !defined (__sparc_v9__)
-
-#warning No suitable get_cycles() implementation. Returning 0 instead
-
-typedef unsigned long long cycles_t;
-
-static inline cycles_t get_cycles(void)
-{
-    return 0;
-}
-
-#endif /* everything else but x86, amd64, sparcv9 or ppc */
-
-
-#endif /* __jack_cycles_h__ */