CLOCK_MONOTONIC_RAW doesn't exist on non-Linux systems.

runtime/os_interface/linux/os_time_linux.cpp:61:21: error:
      use of undeclared identifier 'CLOCK_MONOTONIC_RAW'
    if (getTimeFunc(CLOCK_MONOTONIC_RAW, &ts)) {
                    ^
runtime/os_interface/linux/os_time_linux.cpp:138:24: error:
      use of undeclared identifier 'CLOCK_MONOTONIC_RAW'
    if (resolutionFunc(CLOCK_MONOTONIC_RAW, &ts)) {
                       ^

--- runtime/os_interface/linux/os_time_linux.cpp.orig	2019-11-22 15:41:47 UTC
+++ runtime/os_interface/linux/os_time_linux.cpp
@@ -14,6 +14,10 @@
 
 #include <time.h>
 
+#ifndef CLOCK_MONOTONIC_RAW
+#define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC
+#endif
+
 namespace NEO {
 
 OSTimeLinux::OSTimeLinux(OSInterface *osInterface) {