user: use C++ headers for our built libstdc++.so, not some old copied tree
libload: change lookup logic to fix issues with libstdc++ linkage
libload: R_386_COPY relocations
user: permit RTTI and exceptions in userspace
posix: SIGABRT now prints "Abort" to stdout before killing the process.
ps2mouse: PS/2 mouse support enabled again - very untested though.