Fix CMake build infrastructure for experimental builder

- Add experimental/builder CMakeLists.txt with proper subdirectory structure
- Add placeholder include/ck_tile/builder CMakeLists.txt for header installation
- Fix gtest.cmake to use include_guard to prevent multiple inclusions
- Update root CMakeLists.txt to include full builder directory instead of just tests

CMakeLists.txt

@@ -694,7 +694,7 @@ if (NOT MIOPEN_REQ_LIBS_ONLY)
 endif()
 
 if (CK_EXPERIMENTAL_BUILDER)
-  add_subdirectory(experimental/builder/test)
+  add_subdirectory(experimental/builder)
 endif()
 
 if(CK_USE_CODEGEN AND (SUPPORTED_GPU_TARGETS MATCHES "gfx9" OR GPU_ARCHS))

cmake/gtest.cmake

@@ -1,3 +1,4 @@
+include_guard(GLOBAL)
 include(FetchContent)
 
 set(GOOGLETEST_DIR "" CACHE STRING "Location of local GoogleTest repo to build against")

experimental/builder/CMakeLists.txt

@@ -0,0 +1,3 @@
+if(BUILD_TESTING)
+    add_subdirectory(test)
+endif()

experimental/builder/include/ck_tile/builder/CMakeLists.txt

@@ -0,0 +1 @@
+# Empty placeholder until we add library code.