GCC now assumes by default that the stack is aligned to a 16-byte boundary.
It's very unlikely that parasite head's first call will contain
an SSE instruction which will segfault, but to be pedantically correct
will lose additional 8 bytes.

See also:
http://sourceforge.net/p/fbc/bugs/659/Signed-off-by: Dmitry Safonov <dsafonov@odin.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>