Pull in namespace.h when building all .c files using gcc's -include option,
so that we can provide asm labels for the memcpy/memset/__stack_smash_handler
calls that it generates ab initio. Eliminate direct #includes of it. Make
sure it's a dependency of all objects (unnecessary for asm, but close enough).

ok deraadt@

Fix incorrect behaviour by syncing with FreeBSD; reported by Jonas 'Sortie'
Termansen, thanks!

Add uuid support routines to libc. From FreeBSD via NetBSD via Bitrig via
Markus Mueller.