[CK Tile] enable building examples by default (#3259)

* remove EXCLUDE_FROM_ALL from ck-tile examples
-> +15 min build time w/ 64 threads for a single arch

* fix cpp17 compile error in the ck-tile examples

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Co-authored-by: khuagarw <khuagarw@amd.com>
Co-authored-by: Ding, Yi <yi.ding@amd.com>

tile_engine/ops/gemm/CMakeLists.txt

@@ -64,6 +64,7 @@ function(create_individual_gemm_target datatype layout trait tile_config config_
 
     # Create the executable
     add_executable(${target_name}
+        # to save build time, exclude the target from "all" target of "gemm" directory and its ancestors
         EXCLUDE_FROM_ALL
         ${GEMM_SOURCE_DIR}/gemm_benchmark_single.cpp
         ${instance_header}