[RUNTIME][OPENCL] Make OpenCL runtime Compatible with OpenCL2.0 #2897 (#2950)

There are many OpenCL platforms that do not yet support OpenCL 2.0,
hence we use 1.2 APIs, some of which are now deprecated.  In order
to turn off the deprecation warnings (elevated to errors by
-Werror) we explicitly disable the 1.2 deprecation warnings.

At the point TVM supports minimum version 2.0, this commit can be
reverted.

src/runtime/opencl/opencl_common.h

@@ -11,6 +11,16 @@
 #include <tvm/runtime/device_api.h>
 #include <dmlc/logging.h>
 
+/* There are many OpenCL platforms that do not yet support OpenCL 2.0,
+ * hence we use 1.2 APIs, some of which are now deprecated.  In order
+ * to turn off the deprecation warnings (elevated to errors by
+ * -Werror) we explicitly disable the 1.2 deprecation warnings.
+ *
+ * At the point TVM supports minimum version 2.0, we can remove this
+ * define.
+ */
+#define CL_USE_DEPRECATED_OPENCL_1_2_APIS
+
 #ifdef __APPLE__
 #include <OpenCL/opencl.h>
 #else