Fix build for Unices without CLOCK_MONOTONIC_RAW

CLOCK_MONOTONIC_RAW was introduced in Linux 2.6.28 and glibc 2.12. In
order to build the CTS on non-Linux Unices or older Linux distros we
should only compile-in usage of CLOCK_MONOTONIC_RAW when it is available
at build-time.

Components: Vulkan

VK-GL-CTS issue: 2696

Affects:
dEQP-VK.pipeline.timestamp.calibrated.host_domain_test

Change-Id: I937d4ea6350fe0b70c0028d9ae48b9234e425fdf
diff --git a/external/vulkancts/modules/vulkan/pipeline/vktPipelineTimestampTests.cpp b/external/vulkancts/modules/vulkan/pipeline/vktPipelineTimestampTests.cpp
index 65ea4f0..292ad90 100644
--- a/external/vulkancts/modules/vulkan/pipeline/vktPipelineTimestampTests.cpp
+++ b/external/vulkancts/modules/vulkan/pipeline/vktPipelineTimestampTests.cpp
@@ -1189,10 +1189,10 @@
 	DE_ASSERT(hostDomain == VK_TIME_DOMAIN_CLOCK_MONOTONIC_EXT ||
 			  hostDomain == VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT);
 
-#if (DE_OS == DE_OS_QNX)
-	clockid_t id = CLOCK_MONOTONIC;
-#else
+#if defined(CLOCK_MONOTONIC_RAW)
 	clockid_t id = ((hostDomain == VK_TIME_DOMAIN_CLOCK_MONOTONIC_EXT) ? CLOCK_MONOTONIC : CLOCK_MONOTONIC_RAW);
+#else
+	clockid_t id = CLOCK_MONOTONIC;
 #endif
 	struct timespec ts;
 	if (clock_gettime(id, &ts) != 0)