The latter had the effect of removing the benefit of optimization settings, i.e. a typical compiler
command would look like:
<toolchain-compiler> .... -Isources/<module-path> -I -O2 -g
The "-I -O2" was interpreted literally as "search in '-O2' directory, and the optimization was
never set to 2 (or 0 in case of debug mode).
* changes:
Force --no-undefined at link time to generate an error when trying to generate a shared library that references undefined symbols. This can be overriden by defining LOCAL_ALLOW_UNDEFINED_SYMBOLS in your Android.mk to 'true'
