Add gnustl+rtti version of cpp full library

Adding new version of cpp  library,
'libprotobuf-cpp-2.3.0-full-gnustl-rtti'. Previously, c++ code
compiled against gnustl couldn't link with this library - having
both gnustl and stlport in same binary leads to nasty conflicts.

Bug: 7484202
Change-Id: Ic4fbbfc2839c4ce88bf605cf3d9cca47b146f965
1 file changed