Squashed 'libs/protobuf/' content from commit fcd3b9a85

git-subtree-dir: libs/protobuf
git-subtree-split: fcd3b9a85ef36e46643dc30176cea1a7ad62e02b

php/ext/google/protobuf/config.m4

@@ -0,0 +1,11 @@
+PHP_ARG_ENABLE(protobuf, whether to enable Protobuf extension, [  --enable-protobuf   Enable Protobuf extension])
+
+if test "$PHP_PROTOBUF" != "no"; then
+
+  PHP_NEW_EXTENSION(
+    protobuf,
+    arena.c array.c convert.c def.c map.c message.c names.c php-upb.c protobuf.c third_party/utf8_range/naive.c third_party/utf8_range/range2-neon.c third_party/utf8_range/range2-sse.c,
+    $ext_shared, , -std=gnu99)
+  PHP_ADD_BUILD_DIR($ext_builddir/third_party/utf8_range)
+
+fi