[PHP] fix PHP build system

Makefile.am

@@ -837,6 +837,7 @@ php_EXTRA_DIST=                                                       \
   php/ext/google/protobuf/package.xml                                 \
   php/ext/google/protobuf/php-upb.c                                   \
   php/ext/google/protobuf/php-upb.h                                   \
+  php/ext/google/protobuf/php_protobuf.h                              \  
   php/ext/google/protobuf/protobuf.c                                  \
   php/ext/google/protobuf/protobuf.h                                  \
   php/ext/google/protobuf/wkt.inc                                     \

php/ext/google/protobuf/php_protobuf.h

@@ -0,0 +1,45 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2022 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+// ! THIS FILE ONLY APPROACHING IN-TREE PHP EXTENSION BUILD !
+// ! DOES NOT USE NORMALLY.                                 !
+// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#ifndef PHP_PROTOBUF_H
+# define PHP_PROTOBUF_H
+
+# ifdef HAVE_CONFIG_H
+#  include "config.h"
+# endif
+
+extern zend_module_entry protobuf_module_entry;
+# define phpext_protobuf_ptr &protobuf_module_entry
+
+#endif	/* PHP_PROTOBUF_H */