pw_tokenizer: CMake build

Change-Id: I2fef5f7f3a9b5dfb01487ef678aa978875830dc8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 451bf7c..1261810 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,5 +27,6 @@
 add_subdirectory(pw_span)
 add_subdirectory(pw_status)
 add_subdirectory(pw_string)
+add_subdirectory(pw_tokenizer)
 add_subdirectory(pw_unit_test)
 add_subdirectory(pw_varint)