Fix a chicken-and-egg problem: this files implements SSP support,

Fix a chicken-and-egg problem: this files implements SSP support,
so we cannot compile it with -fstack-protector[-all] flags (or
it will self-recurse); this is ensured in sys/conf/files.  This
OTOH means that checking for defines __SSP__ and __SSP_ALL__ to
determine if we should be compiling the support is impossible
(which it was trying, resulting in an empty object file).  Fix
this by always compiling the symbols in this files.  It's good
because it allows us to always have SSP support, and then compile
with SSP selectively.

Repoted by:	tinderbox