Fix clang tooling build on Linux (shim CMake in LLVM tree).

tools/clang/blink_gc_plugin/CMakeLists.txt

Index: tools/clang/blink_gc_plugin/CMakeLists.txt
diff --git a/tools/clang/blink_gc_plugin/CMakeLists.txt b/tools/clang/blink_gc_plugin/CMakeLists.txt
index 9dab2691344c5d74f0c641b284da3ddadc3b8a9f..df2bc63e7274982f5a9e98448ce56777fcaa0040 100644
--- a/tools/clang/blink_gc_plugin/CMakeLists.txt
+++ b/tools/clang/blink_gc_plugin/CMakeLists.txt
@@ -8,10 +8,10 @@ add_llvm_loadable_module("lib${LIBRARYNAME}"
                          RecordInfo.cpp
                         )
 
-install(TARGETS "lib${LIBRARYNAME}" LIBRARY DESTINATION lib)
+cr_install(TARGETS "lib${LIBRARYNAME}" LIBRARY DESTINATION lib)
 
 cr_add_test(blink_gc_plugin_test
   ${CMAKE_CURRENT_SOURCE_DIR}/tests/test.sh
-  ${LLVM_BUILD_DIR}/bin/clang
+  ${CMAKE_BINARY_DIR}/bin/clang
   $<TARGET_FILE:lib${LIBRARYNAME}>
   )