Sync icing CMake file with icu cmake changes

Change-Id: Ie19fc29103618ed441f8b32ce22d76a974f61cbb
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a740924..70f6852 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,7 +45,7 @@
 # Compile libandroidicu
 set(ICU_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../icu/libandroidicu")
 set(ICU_TARGET_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/icu-target")
-add_subdirectory(${ICU_SOURCE_DIR} ${ICU_TARGET_BINARY_DIR})
+add_subdirectory("${ICU_SOURCE_DIR}/static_shim" ${ICU_TARGET_BINARY_DIR})
 
 # Glob Icing proto sources. Results look like this: icing/proto/document.proto
 file(