This will be used for libcxx.
libcxxabi is needed as libsupc++ is not good enough for libcxx. It uses
GCC specific stuff which causes failed compilation for some packages.
There are also runtime issues, most notably with cxxopts where the
program just crashes.
Reference: https://github.com/gerbera/gerbera/issues/795
Added patch to fix ARM compilation.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
