Add basic support for the Blackfin architecture

For uClibc, the name of the Blackfin architecture is 'bfin'. Actually,
the naming of the architecture is quite messy: for toolchain tuples
and uClibc, it's bfin, but for the kernel, it's blackfin. We've
arbitraly choosen to name it "blackfin" in Crosstool-NG.

Add Blackfin-related uClibc patch to fix a build failure related to
fork() being used in unistd/daemon.c.

Yann E. MORIN:
Apply the patch to the kernel/linux build script to use 'linux'
in the noMMU tuples. See:
http://sourceware.org/ml/crossgcc/2010-04/msg00010.html

 # Configuration file for sstrip tool facility

 # depends on ! BACKEND

 comment "sstrip"

     depends on ARCH_BINFMT_ELF

 config SSTRIP

     bool

     prompt "sstrip"

     depends on ARCH_BINFMT_ELF

     help

       The sstrip utility, to maximise the striping of ELF binaries

       (executables and libraries).

       Buildroot version, forked off the original from ELFkickers.  This one

       is somewhat maintained by the buildroot guys.   

       Supports big-endian systems.