Remove an out of date detail.

need to explicitly turn on exceptions or RTTI support. For information on how to do this, see

<a href="#xp">C++ Exceptions</a> and <a href="#rt">RTTI</a>.</p>

<p>The NDK provides prebuilt static and shared libraries for {@code libc++} compiled by Clang 3.4,

but you can force the NDK to rebuild {@code libc++} from sources by adding the following line to

your {@code Application.mk} file, or setting it in your environment prior to building: </p>

<p>The NDK provides prebuilt static and shared libraries for {@code libc++}, but you can force the

NDK to rebuild {@code libc++} from sources by adding the following line to your

{@code Application.mk} file, or setting it in your environment prior to building: </p>

<pre>

LIBCXX_FORCE_REBUILD := true