libphobos: Add AArch64 Linux as a supported target.

libphobos/ChangeLog:

2019-04-24  Iain Buclaw  <ibuclaw@gdcproject.org>

	* configure.tgt: Add aarch64*-*-linux* as a supported target.

From-SVN: r270524

libphobos/ChangeLog

+2019-04-24  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* configure.tgt: Add aarch64*-*-linux* as a supported target.
+
 2019-04-23  Iain Buclaw  <ibuclaw@gdcproject.org>
 	    Robin Dapp  <rdapp@linux.ibm.com>
 

libphobos/configure.tgt

@@ -23,6 +23,9 @@
 # broken systems.  More targets shall be added after testing.
 LIBPHOBOS_SUPPORTED=no
 case "${target}" in
+  aarch64*-*-linux*)
+	LIBPHOBOS_SUPPORTED=yes
+	;;
   arm*-*-linux*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;