Remove no longer needed patches.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

This adds $STAGING_DIR to library search paths in setup.py, to avoid
picking up host libraries when linking.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

Don't warn on deprecated declarations.

Rename warning patch. It's specific to foritfy-headers.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: W. Michael Petullo <mike@flyn.org>