fix OpenCL on mac thank to mevikas (https://code.google.com/p/tesseract-ocr/issues/detail?id=1479)

Author: zdenop

opencl/openclwrapper.cpp

@@ -2985,6 +2985,8 @@ double composeRGBPixelMicroBench( GPUEnv *env, TessScoreEvaluationInputData inpu
 #if ON_WINDOWS
     LARGE_INTEGER freq, time_funct_start, time_funct_end;
     QueryPerformanceFrequency(&freq);
+#elif ON_APPLE
+    mach_timespec_t time_funct_start, time_funct_end;
 #else
     TIMESPEC time_funct_start, time_funct_end;
 #endif
@@ -3057,6 +3059,8 @@ double histogramRectMicroBench( GPUEnv *env, TessScoreEvaluationInputData input,
 #if ON_WINDOWS
     LARGE_INTEGER freq, time_funct_start, time_funct_end;
     QueryPerformanceFrequency(&freq);
+#elif ON_APPLE
+    mach_timespec_t time_funct_start, time_funct_end;
 #else
     TIMESPEC time_funct_start, time_funct_end;
 #endif
@@ -3160,6 +3164,8 @@ double thresholdRectToPixMicroBench( GPUEnv *env, TessScoreEvaluationInputData i
 #if ON_WINDOWS
     LARGE_INTEGER freq, time_funct_start, time_funct_end;
     QueryPerformanceFrequency(&freq);
+#elif ON_APPLE
+    mach_timespec_t time_funct_start, time_funct_end;
 #else
     TIMESPEC time_funct_start, time_funct_end;
 #endif
@@ -3234,6 +3240,8 @@ double getLineMasksMorphMicroBench( GPUEnv *env, TessScoreEvaluationInputData in
 #if ON_WINDOWS
     LARGE_INTEGER freq, time_funct_start, time_funct_end;
     QueryPerformanceFrequency(&freq);
+#elif ON_APPLE
+    mach_timespec_t time_funct_start, time_funct_end;
 #else
     TIMESPEC time_funct_start, time_funct_end;
 #endif

opencl/openclwrapper.h

@@ -74,6 +74,14 @@
 #define PERF_COUNT_VERBOSE 1
 #define PERF_COUNT_REPORT_STR "[%36s], %24s, %11.6f\n"
 
+#if ON_APPLE
+#include <time.h>
+#include <mach/clock.h>
+#include <mach/mach.h>
+#define CLOCK_MONOTONIC SYSTEM_CLOCK
+#define clock_gettime clock_get_time
+#endif
+
 
 #if ON_WINDOWS