coreutils: Make it build on OSX 10.0.8

Take patch from: https://lists.gnu.org/archive/html/bug-coreutils/2013-01/msg00119.html
coreutils: 8.20 does build on Darwin

Where gcc is:

i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
gettext: Guard against compiler not supporting __builtin_stpncpy

From https://lists.macosforge.org/pipermail/macports-dev/2011-July/015263.html:

5) Building with a compiler that doesn't support newer __builtins

If your port uses MacPorts compilers rather than the default compiler,
you may run into trouble with string functions.  You'll see errors at
link time about undefined __builtin_* functions.  If this happens, you
may want to compile with -D_FORTIFY_SOURCE=0 to tell the headers to
use unfortified versions which do not use compiler builtins.
coreutils: Remove 8.19 reference
coreutils: Guard against compiler not supporting __builtin_stpncpy_chk

From https://lists.macosforge.org/pipermail/macports-dev/2011-July/015263.html:

5) Building with a compiler that doesn't support newer __builtins

If your port uses MacPorts compilers rather than the default compiler,
you may run into trouble with string functions.  You'll see errors at
link time about undefined __builtin_* functions.  If this happens, you
may want to compile with -D_FORTIFY_SOURCE=0 to tell the headers to
use unfortified versions which do not use compiler builtins.
coreutils,gettext: don't change hash except for darwin

Also some style cleanup.
Note that defining an empty-string variable *does* change the hash.
I would like to change this behaviour one day
(clean up attrs when compiling the derivation).
darwin: update coreutils and other fixes (close #939)
Darwin support for Go 1.1 (close #952)
fail2ban: fix build on darwin (close #933)
emacs24: fix build on darwin (clos #932)
djvulibre: fix build on darwin (close #931)
deluge: fix build on darwin (close #930)
emacs24: fix license typo, change indentation

Note that the double-quote "indented strings" strip indentation,
so this ugly style was pointless.