Static link to libstdc++ and libgcc for Linux
Static link to libstdc++ and libgcc for Linux

Some restricted environments do not have libgcc and libstdc++ available.
Instead, statically link them in for maximal compatibility.

The tradeoff is that this increases the final size of the jar by around 500k.
Longer term it may be possible to remove the dependency on these libraries
altogether.

Fixes #874

google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt