Description: Don't try to use sysinfo or CLOCK_MONOTONIC_RAW on non-Linux

Fixes two FTBFS on kfreebsd due to use of Linux-specific features:
https://buildd.debian.org/status/fetch.php?pkg=beignet&arch=kfreebsd-amd64&ver=1.0.1-3&stamp=1425101150
https://buildd.debian.org/status/fetch.php?pkg=beignet&arch=kfreebsd-amd64&ver=1.1.1-1&stamp=1445338350

Origin: https://github.com/freebsd/freebsd-ports-graphics/blob/opencl/lang/beignet/files/patch-src_cl__device__id.c https://github.com/freebsd/freebsd-ports-graphics/blob/master/lang/beignet/files/patch-src_cl__event.c
Author: Koop Mast, Rebecca Palmer

--- a/src/cl_device_id.c
+++ b/src/cl_device_id.c
@@ -34,7 +34,12 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#if defined(linux) || defined(__linux__) || defined(__LINUX__)
 #include <sys/sysinfo.h>
+#else
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
 
 #ifndef CL_VERSION_1_2
 #define CL_DEVICE_BUILT_IN_KERNELS 0x103F
@@ -767,11 +772,24 @@ kbl_gt4_break:
   #define toMB(size) (size)&(UINT64_MAX<<20)
   /* Get the global_mem_size and max_mem_alloc size from
    * driver, system ram and hardware*/
+#if defined(linux) || defined(__linux__) || defined(__LINUX__)
   struct sysinfo info;
   if (sysinfo(&info) == 0) {
+    uint64_t totalram = info.totalram * info.mem_unit;
+#else
+  {
+  int mib[2];
+
+  mib[0] = CTL_HW;
+  mib[1] = HW_USERMEM;
+
+  uint64_t totalram;
+  size_t len;
+  len = sizeof(totalram);
+  sysctl(mib, 2, &totalram, &len, NULL, 0);
+#endif
     uint64_t totalgpumem = ret->global_mem_size;
 	uint64_t maxallocmem = ret->max_mem_alloc_size;
-    uint64_t totalram = info.totalram * info.mem_unit;
 	/* In case to keep system stable we just use half
 	 * of the raw as global mem */
     ret->global_mem_size = toMB((totalram / 2 > totalgpumem) ?
--- a/src/cl_event.c
+++ b/src/cl_event.c
@@ -22,6 +22,7 @@
 #include "cl_alloc.h"
 #include <string.h>
 #include <stdio.h>
+#include <time.h>
 
 // TODO: Need to move it to some device related file later.
 static void
