Update notes for submitted changes

* Remove netd_client. It has moved to the internal tree.
Update notes for submitted changes

* libctest: zap
Update notes for submitted changes

* Clarify multiarch warnings
Update notes for submitted changes

* Split the rules to build the odex file
Update notes for submitted changes

* Add some more flags to CLANG_CONFIG_UNKNOWN_CFLAGS
Update notes for submitted changes

* set a prebuilt directory name for the 2nd arch
* add vendor directories to gdb shared library search path
* add 2nd arch gcc to the path
* fix paths when 2nd arch gcc is a different version