configure: Add ARM64 define.

configure

@@ -14995,6 +14995,32 @@ if test $ac_cv_cpp_def___powerpc__ = yes; then :
   CFLAGS="$CFLAGS -D__powerpc__"
   LINTFLAGS="$LINTFLAGS -D__powerpc__"
 fi ;;
+  *aarch64*)        { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we need to define __aarch64__" >&5
+$as_echo_n "checking whether we need to define __aarch64__... " >&6; }
+if ${ac_cv_cpp_def___aarch64__+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifndef __aarch64__
+yes
+#endif
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "yes" >/dev/null 2>&1; then :
+  ac_cv_cpp_def___aarch64__=yes
+else
+  ac_cv_cpp_def___aarch64__=no
+fi
+rm -f conftest*
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_cpp_def___aarch64__" >&5
+$as_echo "$ac_cv_cpp_def___aarch64__" >&6; }
+if test $ac_cv_cpp_def___aarch64__ = yes; then :
+  CFLAGS="$CFLAGS -D__aarch64__"
+  LINTFLAGS="$LINTFLAGS -D__aarch64__"
+fi ;;
   *arm*)            { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we need to define __arm__" >&5
 $as_echo_n "checking whether we need to define __arm__... " >&6; }
 if ${ac_cv_cpp_def___arm__+:} false; then :

configure.ac

@@ -2486,6 +2486,7 @@ case $host_cpu in
   *sparc*)          WINE_CHECK_DEFINE([__sparc__]) ;;
   *powerpc64*)      WINE_CHECK_DEFINE([__powerpc64__]) ;;
   *powerpc*)        WINE_CHECK_DEFINE([__powerpc__]) ;;
+  *aarch64*)        WINE_CHECK_DEFINE([__aarch64__]) ;;
   *arm*)            WINE_CHECK_DEFINE([__arm__]) ;;
 esac