[patch] Fix libstdc++ build for Android

[Eric Botcazou]

Hi,

libstdc++-v3 already contains support but doesn't build for Android.  Now GDB 
has switched to C++, which means that you need a C++ cross-build for GDBserver 
in order to debug a program on the target.

Tested on x86_64-suse-linux and arm-linux-androideab, OK for mainline?


2017-06-02  Eric Botcazou  <ebotcazou@adacore.com>

        * configure.ac (*-*-linux-android*): Set target_makefile_frag.
        * configure: Regenerate.
config/
        * mt-android: New file.
libstdc++-v3/
        * src/filesystem/dir.cc (fs::_Dir::advance): Use std::exchange.

-- 
Eric Botcazou
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