libphobos, Darwin: Enable libphobos for most Darwin.

Earlier Darwin systems can be made to work too - but they need non-
standard 'binutils', so for now these must be enabled specifically.

libphobos/ChangeLog:

	* configure.tgt: Enable libphobos for Darwin >= 12.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

libphobos/configure.tgt

@@ -27,6 +27,9 @@ case "${target}" in
   *-*-dragonfly*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;
+  aarch64-*-darwin2*)
+	LIBPHOBOS_SUPPORTED=yes
+	;;
   aarch64*-*-linux*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;
@@ -58,6 +61,12 @@ case "${target}" in
   sparc*-*-solaris2.11*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;
+  *-*-darwin9* | *-*-darwin1[01]*)
+	LIBDRUNTIME_ONLY=yes
+	;;
+  x86_64-*-darwin1[2-9]* | x86_64-*-darwin2* | i?86-*-darwin1[2-7])
+	LIBPHOBOS_SUPPORTED=yes
+	;;
   x86_64-*-freebsd* | i?86-*-freebsd*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;