[coreboot] libpayload: gcc-wrappers (round 2)

[Jordan Crouse]

Based on commments, here is the gcc-wrappers patch again.  I added 
detection for -fno-stack-protector and moved the wrappers to the
bin/ directory for consistency.

Not seen here is the move of libpayload.ldscript to lib/ - that will
go in as a svn mv during commit.

Once this code gets committed, then we can add libpayload and coreinfo
and tint into buildrom.  yay!

Jordan