[CMake] Fix standalone build after LLVM exports utility targets

LLVM started exporting targets for utilites with https://reviews.llvm.org/rL350959, which broke compiler-rt standalone builds because it was used to define FileCheck manually.
Changed this, so FileCheck gets imported now.
diff --git a/compiler-rt/test/CMakeLists.txt b/compiler-rt/test/CMakeLists.txt
index 554ba5f..2e239d5 100644
--- a/compiler-rt/test/CMakeLists.txt
+++ b/compiler-rt/test/CMakeLists.txt
@@ -15,8 +15,6 @@
 endif()
 
 if(COMPILER_RT_STANDALONE_BUILD)
-  add_executable(FileCheck IMPORTED GLOBAL)
-  set_property(TARGET FileCheck PROPERTY IMPORTED_LOCATION ${LLVM_TOOLS_BINARY_DIR}/FileCheck)
   list(APPEND SANITIZER_COMMON_LIT_TEST_DEPS FileCheck)
 endif()