st/clover: Define __OPENCL_VERSION__ on the device side

This is required by the OpenCL standard.

Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Vedran Miletić <vedran@miletic.net>

src/gallium/state_trackers/clover/llvm/invocation.cpp

@@ -153,6 +153,9 @@ namespace {
       // Add libclc include
       c.getPreprocessorOpts().Includes.push_back("clc/clc.h");
 
+      // Add definition for the OpenCL version
+      c.getPreprocessorOpts().addMacroDef("__OPENCL_VERSION__=110");
+
       // clc.h requires that this macro be defined:
       c.getPreprocessorOpts().addMacroDef("cl_clang_storage_class_specifiers");
       c.getPreprocessorOpts().addRemappedFile(