Add address sorting submodule for use in c-ares wrapper
diff --git a/config.m4 b/config.m4
index 9b7b6bb..9487ffb 100644
--- a/config.m4
+++ b/config.m4
@@ -39,6 +39,9 @@
     src/php/ext/grpc/server.c \
     src/php/ext/grpc/server_credentials.c \
     src/php/ext/grpc/timeval.c \
+    third_party/address_sorting/address_sorting.c \
+    third_party/address_sorting/address_sorting_posix.c \
+    third_party/address_sorting/address_sorting_windows.c \
     src/core/lib/gpr/alloc.cc \
     src/core/lib/gpr/arena.cc \
     src/core/lib/gpr/atm.cc \
@@ -704,6 +707,7 @@
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/tsi/alts/handshaker)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/tsi/alts/zero_copy_frame_protector)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/tsi/ssl/session_cache)
+  PHP_ADD_BUILD_DIR($ext_builddir/third_party/address_sorting)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/boringssl/crypto)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/boringssl/crypto/asn1)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/boringssl/crypto/base64)