Fix compiler version check.

include/hip/hcc_detail/grid_launch_GGL.hpp

@@ -19,10 +19,10 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
+#pragma once
 
 #if GENERIC_GRID_LAUNCH == 1
     #if __hcc_workweek__ >= 17481
-        #define FUNCTIONAL_GRID_LAUNCH 1
         #include "functional_grid_launch.hpp"
     #else
         #include "macro_based_grid_launch.hpp"

src/grid_launch.cpp

@@ -22,7 +22,7 @@ THE SOFTWARE.
 
 #include "hip/hcc_detail/grid_launch_GGL.hpp"
 
-#if defined(FUNCTIONAL_GRID_LAUNCH)
+#if __hcc_workweek__ >= 17481
     #include "functional_grid_launch.inl"
 #else
     #include "macro_based_grid_launch.inl"