Add support for Aarch64 (ARM64)

Add support for Aarch64, the 64-bit ARM architecture.

Makefile

@@ -335,6 +335,10 @@ ifneq (,$(findstring "$(PLATFORM)", "linux" "gnu_kfreebsd" "kfreebsd-gnu"))
   else
   ifeq ($(ARCH),s390x)
     LIB=lib64
+  else
+  ifeq ($(ARCH),aarch64)
+    LIB=lib64
+  endif
   endif
   endif
   endif

code/qcommon/q_platform.h

@@ -205,6 +205,8 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #define ARCH_STRING "sparc"
 #elif defined __arm__
 #define ARCH_STRING "arm"
+#elif defined __aarch64__
+#define ARCH_STRING "aarch64"
 #elif defined __cris__
 #define ARCH_STRING "cris"
 #elif defined __hppa__